Probably it wouldn't as fast as the last block is mined.
But the problem is the remaining transaction, we know miner and transaction is always related each other but if the transaction still keep ongoing i think its not a problem but maybe the fee will become much higher.
Yeah this is right as long as they related each other and know how to handle it properly.We don't have to worry about this because it will never be happened.This is only a thought but the truth is bitcoin will be long last forever.