I'm conflicted on this because it could end up being just too much stuff to do.
Like, it really bums me out that I'll probably never meet Marina again in Yakuza 0 now that I've completed the Real Estate Royale questline, and she's my favorite supporting character in the game, but there's also so much stuff to see and do that it could end up dragging the game down if I still had to keep visiting everyone to get the rest of the dialogue. At some point it could end up just feeling like work instead of a cool way of continuing a relationship. And that wasn't even a romantic one.
I do, however, wish the main story dialogue reflected in some way the growth the characters go through in their social links in Persona games. It feels weird to see them "regressing" in main story missions. Not having a reason to hang out with them anymore can be justified with what I said above, but there's no reason for at least the main story to not reflect that growth.
Well, there's budget for one, but I'd honestly take the dialogue being fixed and reflecting the social links even if I didn't do them over what we have now. It even makes sense, since it changes the characters from "they were able to grow because the MC helped them" to "the MC was present as they were growing, but wasn't required". If the problem is implementing different dialogues based on social links, then don't. It's ok if my character isn't the center of the universe for once.
