The most senior devs already left the sinking core ship. More will follow.
The question is really not how many will leave. Its how many will stay and fight, and how much damage will they do.
as long as bitcoin succeed does it matter? no, who care who is behind the scene this thing is decentralized or at least is supposed to be so
But will it succeed. And what percent of market share will it permanently lose due to the bad press, delays, and financial carnage that will undoubtedly come from the actions these few diehard bitcoin kidnapping rebels...... the Core/Blockstream Hijaakers...... These Crypto-Terrorists..... That is the issue.