Things don't automatically get better. It is hard work, it sucks, and it's not for everyone. It will take years to undo the damage of this transition. We will still be working on it in a decade. There are some very subtle gains like HOL-blocking. I'm not convinced that outweighs current actualized improvements in TCP congestion control (BBR), and for any application I can think of the places that really need something message-oriented seem better covered by WebRTC.
What you are really talking about is Full Employment Theorem.
What "damage" are you talking about? The only issues are compatibility and increased resource utilization on the server-side, both of which will get better as usage increases. It's not a problem. We go through these cycles all the time with all kinds of technology and there's nothing special here.
QUIC is a new protocol is to make user experiences better. There's a tradeoff in more server CPU but that's cheaper, more scalable, and will only be short-term as things quickly improve. The actual comparison would be rendering engines and Javascript runtimes that have become more complicated to build and run but are faster and more functional in return.
Nobody would return back to the 2010 tech days just because some people decided to make fat websites.
QUIC/HTTP3 as a protocol is a great improvement to actual internet performance for users which is what really matters.