I still play TheSims2, so I don't see why I wouldn't play TS4 in 2024. I am in absolutely no hurry for them to release Sims5 and to go back to a base game. In any case, I will probably do what I did for TS4 and wait for a little while for the first updates/patches/expansions/sales to be released.
I am also part of those who think expansions have been solid, considering I only bought those who fit my gameplay style and found interesting.
About Paralives, I honestly cannot jump on that hype train. The only images I've seen so far are glorified gifs or a few seconds long video on a loop of very small building details, suggesting the development is still at a very early stage. The biggest part about this type of game is the AI that will make it a life simulation, and so far there are only promises to every Sims4 fan whining about this or that missing their game that "of course" it will be avaible in Paralives.
It's a valid marketing strategy by the devs, but it also brings a lot of pressure upon themselves. I hope they do manage to make a good game though, don't get me wrong, and a little competition is always healthy in an industry, but it's still way too early to tell.
We'll have to wait and see.