I think he's going to manage a team in Qatar first actually. Or get his coaching license? Something like that of course.
So 2018 might be too soon, but it of course depends on him.
Oscar Garcia doing a great job with Salzburg. And the one who deserved the Barça B job years back. On merit.
But Rosell and co. decided to appoint Eusebio instead so might be bad blood as you said, but I'm inclined to believe Bartomeu is learning from some of his mistakes and is willing to leave the politics aside for the club's benefit.
Tuchel a very interesting choice.
Although don't rule Valverde out. The club might decide to go for the safe or easier option.
Tuechel is indeed very interesting, but I don't think he's a realistic option. I believe he's commited to Dortmund project and will stay there for the next few years. At least I hope so because they have a talented young team that I enjoy to watch so hopefully they can keep Tuechel and their best players too see how good they can be in 2-3 years. Although I've heard some rumours that Arsenal is considering him as possible Wenger successor next season but at the end Wenger will most likely stay. But as only 43 years old Tuechel is clearly worth to keep an eye on as our future manager even if in 8-10 years from now. He'll probably be in better club than Dortmund by then and harder to reach but you never know. Things change quickly in football. I think it's possible that RM will go hardly after him (hopefully they won't get him though) when they'll find out that Zidane is not their Pep.
I think Xavi is already doing coaching course in Qatar so he can become a coach immediately after finishing his playing career. Starting at Barça B is probably the best for him but I also wouldn't mind him joining Lucho's coaching staff.
Everyone is discussing who they'd want the manager to be, but what about the manager himself? Would you prefer he be more like Lucho in most aspects, or would you prefer to go back to a Pep mentality, so to speak? Any particular styles of play you'd like to see? Any greater or reduced reliance on La Masia? How about the types of La Masia players given opportunities in general?
Interesting questions. I loved Pep's tiki-taka but I also like a bit more direct style that we play now because I think we are more unpredictable than during Pep's era. Of course that could be more on MSN individual brilliance (and their abilities to play team football as good as they do instead of focusing on their own statistics - I guess we should give Lucho some credit for that too) than Lucho but I think he made the right decision to move our focus from midfield dominance (it's obvious team can't be as dominant without Xavi) to attacking power of MSN.
Whoever our next manager will be I hope he'll find the right mix between both styles. There is no doubt that Xavi's main philosophy will be close to Pep's but he should keep some good things that Lucho implemented. We are more dangerous in counter attacks now and we also improved in set pieces (although I'd like us to score more goals from corners like we did in Lucho's first season). If there will be another manager between Lucho and Xavi I hope he'll have a similar coaching style. He'll probably have at least some playing and/or coaching experience from Barça to know what it's expected of him but even if he'd be an "outsider" like Tuechel I believe he'd find the right balance between possession and direct fooball.
I would like to see more La Masia players promoted to first team but they need to deserve to be there. We have some talented kids that should get an opportunity and I think they will but it's totally on them if /how they'll use it. I want us to win as much as possible during next 3-5 years before Messi will eventually decline because we don't know what will happen after that. Some trophyless seasons could easily await us then so I don't think we should waste too much time and wait on some youngsters that might become good but could also just as easily never be good enough for us.
We've bought young talent this summer that could stay here as future starters (especially Umtiti and Gomes from what we've seen so far) or at least reliable backups (Digne, Denis, possibly Paco and Cillessen) but there are still older players that will need to be replaced (Mathieu, Masche, Arda, Rakitić, Suarez, I could also see Iniesta retire in his mid-thirties; and other younger ones like Rafinha who might not be considered good enough to stay longterm) over the next 2-4 years so there should be some open spots on the team for players like Tarin, Marlon, Alena, Samper, Lee, Mujica,... Yes, we'll bring outside talent to replace some of the above mentioned players when they leave but if our kids will continue to develop good they could convince Lucho or whoever next manager will be they are good enough to stay here (like Roberto had) as squad players for now and possibly something more in the future or if it's better for them to leave on loan/buy-back or even permanently.
Or Mourinho. He could be unemployed this time next year if he'll continue like he started with United. 
