Question:
What happens, when all available Spendable balances in all currently available (online) wallets go to Staking, and there are ~150-200 confirmations left before the Interest awards begin getting confirmed and coins released from Staking back to Spendable? With no Spendable left, who finds next block?
If all goes well, confirmations should eventually be brought down to a reasonable number. That should reduce the possibility of that happening quite significantly.
But my question is who confirms next block?
May be it's the reverse - confirmations should be initially brought down to a reasonable number, so that all goes well with any number of wallets?
edit: in PoW, when there are no hashes, difficulty goes down so that tiniest of hashpower will find a block and move the blockchain.
If the required confirms are too high in the beginning it can be adjusted. Usually staking wallets have a maximum of 6 confirms for every stake found. Generally they don't get stuck as long as there's even the smallest number of participants. 501 confirms was chosen in the beginning to make sure things are running smoothly. The wallet is still being monitored closely.
It is being monitored closely by all of us here, yes. From the observations so far - a PoST-only implementation "closes" the blockchain to the possibility of "renting" external resources to help meet the main target - moving the blockchain at the required rate.
Anyway, what we see now is that we won't even know if things are running smoothly when the blockchain is anything but running - actually it's quite stuck. Time to adjust the required confirms?