If I had to guess, it's less so "planned" and more so that the various institutional and regulatory incentives make this sort of outcome extremely likely.
I think this hits the nail on the head. I think after 2008 they setup a system (set of regulations/rules/policies not some group of monocle wearing dudes in a room scheming) where the BigBanks will eat the SmallBanks, the FDIC will insure what they do and some Federal agency will eat the SmallBank failures and then BigBank can swoop in as a "savior" essentially consuming SmallBank but all that is left is the profitable parts at that point.