It is because the consensus algorithm of POS works perfectly for them. It is designed for the rich to become richer and that's why the Bank of America has said that if they really have said.

And this merge could really lead them to invest more if they have already understood how the technology works and seen the potential of Ethereum. They may have the idea already as it has a large portion of mining.

So, for these institutions, they may really get on track with it investing from millions to billions.