I do not think it is going to happen. Bitcoin is fine as it is, you may remember the saying "if aint broke do not fix it". When someone wants to improve bitcoin there is always an option to fork it.
So you think that is only imagination. So for me, If that will happen in the future. I wish bitcoin will be the same smooth transferring like ethereum.
nothing about ethereum is smooth. haha.
the network is clogged too often, the blockchain is too huge you can never run a full node, the transactions become slow and super expensive if a big ICO starts happening and almost every month someone hacks it and steals millions of dollars worth of ether and other tokens.
... so i hope bitcoin is never "smooth" as ethereum ever