I’m not sure there’s any guarantee that it will ever be sorted, since bit flips will be random and are just as likely to put it more out of order than more in order. Plus if there’s any error correction going on, it can cancel out bit flips entirely until up to a certain threshold.
Though I’m not sure if ECC (and other methods) write the corrected value back to memory or just correct the signals going to the core, so it’s possible they could still add up over time and overcome the second objection.
Technically, they could have. But it wouldn’t have really been Nirvana without Cobain. It was pretty much Cobain’s cult of personality. If they had tried to continue without him, it would have been another one of those bands that starkly contrasts between before and after and the comment above would have been about never knowing Nirvana in its heyday.
Even if the continuation was good (and Dave Grohl is proof that there was enough talent for it in the rest of the band), it would have still been tainted by the lack of Cobain.