I only started Sims 4 this year (but a long time Sims player) and although there are some pet peeves, I am enjoying the game, and I know they are putting effort into fixes, updates and trying to get players top priorities on their radar (via surveys/feedback).
The thing is I like the Sims franchise, and losing players is not just bad for Sims 4, it is bad for future Sims installments. But times are tough also, people are getting tighter and tighter with their budgets, and this is a pretty expensive game even with sales, if you plan to buy everything.
I also know some players' demands are either too demanding (like would break the teen rating) or not just possible for how the game is set up. But some top requests seem reasonable and might be coming to us. I also think there are different types of players pushing for different agendas that the dev team can't appease all, so would eventually have those who lose interest that their agendas aren't following through.
For example there are many players that are wanting in one form or another Sim 2 or 3 features to be added (or have an updated better version added) to Sims 4. Then there are those who want Sims 4 to move further away from the OG and move to ultra realism (which many players also do not want). So it is a case of unable to please everyone, and people move on because of it.