Bitcoin is supposed to work like a payment system but is too slow to compete with the Banking payment system.
If only you knew how slow and expensive the settlement layer of banks is.
If regulation comes into existence than the Banks will be able to control and own Bitcoin as they did for Gold.
Banks can only regulate the ownership of bitcoin, but they definitely won't be able to control it. If banks will be able to control bitcoin, they probably would've done it in the past already, and that would automatically make bitcoin a failure. As time goes, it only gets harder and harder for them.
Banks probalby allready control Blockstream, which has a huge influence on the decisions in the bitcoin core team.
They allready managed to not raise the blocksize, and make bitcoin therefor no longer usable as peer to peer money. Segwit changes nothing as far as transaction speed is concerned and the lightning network is over 80% written by blockstream probably again to make it possible to enrich large bag holders who can charge fees for transactions( just like banks do) I think they have done a pretty good job so far with making bitcoin a failure.