I do understand your perspective but IMO there are a lot more factors to consider than the individual player.
First off, do we really need our goddamn RB to 'break down' teams if we can instead shift the role of dynamic attacker to the wing forward? Guys like Neymar or (theoretically after improvement) Deulofeu are ball carriers and do create space for themselves. Over the past 4 years we've only had one 'winger' that was a ball carrier, Iniesta in 12/13 (Messi was more of a central free role so Alves always dominated the flank). In that season, Iniesta got his highest assist total while linking up beautifully and being SUPPORTED by Alba. Alba wasn't the dominator of the flank or anything but his constant movements and linkups helped the play greatly, like Montoya can do on the right.
It isn't a conservative approach, we're not subtracting. We're just shifting the orientation of our attack. Instead of coming from a creative fullback way up the pitch, it's in the form of two wingers supported by energetic/technical fullbacks. Our total football approach is flexible enough for us to shift around emphasis and work with different types of players rather than strictly Villa/Pedro wingers and Alves RB. If Neymar/Deulo is up in a 1v1, having a FB bomb up on the overlap instantly increases the amount of dimension he has. If he's carrying the ball up the pitch, the overlap will free up space or markers for him and allow him to make a decision.
The thing that is improved is that we'd be balanced on both sides. We can shift our focus from flank to flank, freeing up space on the other. Both can move up and down at will and switch roles with ease. That's a lot more balanced than having one entire side to be unused while the other is overloaded. Besides, the key to parked buses is and always will be playing faster and with quicker transitions so that they can't really assemble it in the first place. Having Alves plopped way up the pitch never really solved our parked bus issue, but I'm betting that if we were to constantly switch between flanks through quick and intense passing play (facilitated by having two successful fullbacks on both sides) we could do it.
Having a free-Ferrari individual on RB is only necessary if we have no other ball carriers to hold the dynamic role. On the left we're gonna have Neymar, Iniesta, etc. On the right we'll have maybe Deulo, maybe Rafinha, and Messi drifting. That's a MASSIVE difference from who we had before in our prime days that allowed Alves to be a dominating dynamic force in attack (Pedro, Villa, Messi in free role mostly central, Eto'o as mobile #9, etc.). It's an evolution all over the pitch. More dynamic responsibility given to our wing forwards and they'll be hugely supported by their fullbacks.