if blockchain end?
this question doesn't even make sense for anyone to begin answering it!
blockchain is not something that ends, it is not a consumable! blockchain is simply the chain of blocks that are being put together to create the public ledger that we are using.
I agree. And now we also have the DAG. Tomorrow we may have hashgraph and/or whatever. Once this type of technology has taken off, there is probably no way to stop its development and evolution.