FUD over quantum is midcurve stuff honestly. Adopting a "quantum safe" algorithm would be relatively simple to do. If the chain was blindsided by it and got hacked, it would be fairly simple and likely not even all that controversial to select a chainstate before the obvious hack and revert. Would do irreparable damage to trust in Bitcoin for sure, but its not particularly difficult from a technical standpoint.
Now discussions about -which- quantum safe algorithm to choose and when to implement that is hotly debated, and actively so if you're listening to the right people. Quantum simply isn't a short term threat so the discussions about solutions get overshadowed by FUDsters. You won't see consensus on something like this until its apparent that its needed. Pressure on this front via FUD is probably good long term, but I don't see it as a looming threat realistically.
Now prematurely adopting the wrong algorithm... specifically one that has a undisclosed vulnerability? Thats deadly. Not something to be rushed and those pushing for urgency here may have ulterior motives worth considering.