Only time will tell.. In my limited knowledge I think it could go either way. The massive wealth accumulation on the ethereum network and the continued wealth accumulation resembles our current fractional reserve banking system... So it could be the institutions wont let it fail because of how much they have invested...
Conversely, they could just be pushing it toward huge changes resulting in a buggy mess to degrade users trust and make it less secure. Don't forget that our world banking players already have in place massive data centers which have the computational power and the ability to overload this "new" merged network with brute force.
It is naive to think that banks will not go down without a fight, as crypto is the single biggest threat to the banking industry. If we get our loans from a crytpo network, what do we need banks for?
ETH could be the chosen "battleground" where banks will try and degrade crypto "trust" and kill the network, or, ETH could be the vector where banks begin to evolve their social enslavement, forcing debt on everyone and everything in the crypto world to keep them bending the knee...
There is absolutely nothing decentralized about proof of stake. Its the exact opposite of what has made crytpo so successful. To change what has worked for so long and been perfected for so long, and then to throw that in the garbage bin, makes no real sense.