Yes, don't think Rafa should be anything else than a short-term solution if Xavi would be sacked mid-season but hopefully won't happen.
I prefer to keep Xavi until June and then re-evaluate situation. Mid-season coaching changes rarely work well. People wanted to sack EV and then we got that farmer to replace him, lol.
BA struggling lately might be a good news in that regard as well. I think Rafa could become a solid coach but nowhere near ready for our first team. Should go prove himself elsewhere and then maybe get a chance in few years.
But given our history of hiring coaches this century don't think the club sees is same way. Rijkaard, Pep, Tito, Tata, Lucho, Setien, Koeman, Xavi were all unproven or with not too convincing CV. Don Ernesto had by far the best career before joining us but don't think many people considered him anything more than an (above) average La Liga manager. Which is still levels above what we can say about Rafa so far.
Ofc sometimes you have to take a risk like we did with Pep and hope it will work out but don't think now it's the time for that. OTOH outside coaches also won't find Barca's job in current situation as attractive as they would in the past knowing their hands to build the team in their own image will be very tied.