How much longer can you tolerate Sims 4's lifespan?

It's the characters that really make it for me. I'm so attached to my Sims and their families, and because of MCCC, even the townie families. Starting all that over would be really hard. I do hope that Sims 5 is awesome enough to make me want to play it, but maybe in addition to 4. I am definitely not done with these characters yet. I've said many times before that I wouldn't play 4 at all if it weren't for the modding community. At this point, I have all the mods I could want and the game is my dream game. Without the mods it would be nothing. With them, it's perfection and I want it to go on for a long time.