This is hilarious.
Banks are telling us that Bitcoin could have been better designed? The biggest problems to face the world have been caused by regulated banks who flouted regulations, or got so friendly with regulators that they could frame regulation to suit them. Bitcoin, thankfully, is out of the grasp of people like these.
I am sure they refer to the currency aspect.
It actually could. Bitcoin in current form isn't capable of handling mass usage properly, which is something we all somewhat experience the negative side effects of. That's why we have to revert to off-chain scaling solutions.
Once lightning network is operational, and it actually gets utilized, and thus not become something like what SegWit is right now, we basically get rid of all Bitcoin's current limitations, which is a massive step forwards.
Regarding SegWit, I find it utter nonsense that it is being ignored on such a large scale as we speak. It would help take off the boiling pressure that the network is suffering from, but no, the economical majority decides otherwise.