Giving a chance to some of the Cantera kids depends on Puyol's fitness, IMO.
If he's unable to play in some part of the season just like now (which is normal, because he's getting old like everybody else), then we'll be exposed with just Pique, Abidal and one Cantera player. I find this extremely risky, tbh.
It's more easy to integrate a midfielder or a striker from the Cantera, because even if they make a mistake it won't be so fatal. But when we're talking about defenders, then making mistakes is starting to sound a little bit different.
If Puyol is fit enough to play in 80% or 90% of the games, then I think we'll be fine with him, Pique, Abidal + 1 cantera. We'll be covered enough. But only if he's fit.