If this actually goes through, there will be no option in the mobile OS market for an OS that both:
a) allows the installation of apps without any contractual relationship with any party, and
b) allows the use of mainstream and secure apps like banking
If anything, they'd eventually deny access from desktop, forcing everyone to login via the fully manages mobile devices without any user freedom.
Some banks are already getting there btw, as their preferred 2fa is a companion app... One small step away from making that the only option, effectively denying access to anyone without a locked down mobile device.
And I have to agree, sadly. We've been inching towards that over the years, and it's entirely possible banks cease providing regular web access to their accounts (which this would necessitate).
But I think there will always be at least some banks that will have web frontend, so you'll just have to be pickier.