When companies start making statements like this, the technology is being accepted and implemented. It doesn't mean the tech is here to stay. The "whole stack" is a humble brag for "we're first to market, we have expertise, you can trust us".
The Financial Review quoted Umar Farooq, JPMorgan Chase’s head of blockchain initiatives, who stated:
“We are the only financial player that owns the entire stack, from the application to the protocol.”