I don't care how bullish we all were for the past decade. There was always a level of uncertainty regarding BTC. Much of that uncertainty will disappear in one week, and BTC just became THAT much less risky as a hedge against inflation, a store of value, and perhaps even as a currency.
You are correct that with a move like this the "doubt" in many people's minds due to years of FUD could go away but time will tell if this is actually a positive thing for volatility or a negative thing. I'm personally worried about government level market manipulation coming to bitcoin from now on. And that is the most dangerous thing that can significantly damage adoption and future bullish trends as US government would be the one doing the "pump and dump" where regular people would lose their lifesavings...
There is also the problem with centralization. We could start seeing more crackdowns on anything US government cannot control; we've already seen what happened to mixers and even wallet softwares that did CoinJoin and of course what they've been doing to exchanges (forcing more surveillance).
On top of that US regime is trying to take control of the mining as well. That's is already terrible for bitcoin not to mention for the US electrical grid that is already experiencing a lot of problems and some predict "power shortfall" in the next decade. That only means crackdowns and centralization would get worse.