I think that there are a lot of people who are like you. They see it as one last leg of the journey - to win the Champions League. Once they've seen it happen, they might view things differently.
In the pre-takeover era, a good many of us might have sold an organ to be at an FA Cup final. I could never understand United fans in my extended family who were blasé about success. They were ST holders but would miss some cup finals. I didn't get it, but 15 major honours later I certainly do. I had to be there at the 2011 semi and final for obvious reasons, and of course 93:20. In the years since however, it no longer feels unmissable. The first trophy lift I missed was 2019 at Brighton and it didn't hurt. I missed the 2020 and 2021 LC finals and PL lift that year. None of them hurt. I'm glad I was at the 2022 PL lift, but would it have hurt had I missed it? Probably not, even factoring in that it was an extraordinary game.
I was at the Chelsea match in Porto and, barring a load of tickets going missing, should be at the Inter match in Istanbul. IF we win against Inter then I may feel that any subsequent finals in the CL aren't worth the hassle of attending. It would be our first CL and may complete a treble. Unless we ever end up in quadruple territory (which I think is unlikely after next season as I can see the League Cup not including sides playing in Europe), where do you go after getting over that hurdle? Yes, you live in the drama of the season and kick every ball, but does actually being there feel like your life depends on it when you've scaled that mountain once before? I'm not sure it does, so when you take this alongside general antipathy towards UEFA, I can see quite a few saying "no more" to the CL scheme if we win it this season.