If there’s any life and money to be made in a simulation game, EA will make it. Sims 5 will come in that case. When It does the sims 4 will still be there and those that like it can still play it.
EA haven’t announced a sims 5 because they aren’t ready to, when it suits them and they have something to show they will. The sims 4 is not endless, it never has been and it will have an end date. I’m not being funny but the amount of bugs the game has does not bode well for future proofing it’s performance.
And while I agree about micro transactions and hate them with every bone in my body, I am sure if they can find a loophole to get them in a new sims game they will.
If they catered to fans of the sims 2 and 3 and moved the series forward instead of rolling it backwards I think a sims 5 could potentially do well with the right audience. That being said I have zero faith EA will make that game. Sad but true.