Longer than A16 did...
No release is going to please everyone and any change always results in an uptick in negative reviews because no matter how good the change it will still rub the person who liked it better before the wrong way and those angry people are more likely to write in about it than happy or nonplussed people.
I'm not discounting your personal feelings that A17 turned you off and you are hoping that A18 will turn things around. I know many are feeling that as well. However, since we are speaking generally, generally A17 has had more staying power than A16 did. It's easy to remember the year of A16.4 rather than the 1-3 months of A16experimental - A16.3 which were not all happiness and rainbows. People were ticked about the loss of crafting experience, the loss of smell, and the horribly OP stealth abilities of the player which made nights an absolute joke. Zombie pathing was horrible as well. A16 had its own fair share of posts unfavorably comparing it with A15 which was everyone's fondly remembered belle of the ball.
I know there are still some very vocal people who are still very much against the design changes in A17. I think most generally unhappy people are mainly just upset about RWG, zombies with perfect information, and performance. I think that if TFP can get these three general complaints fixed and then keep going the route of option menu configurations for other issues that are more personal preference and gamestyle issues they will be in the clear as far as general customer satisfaction goes.
The hardline player that has one favorite feature that they believed was a "core feature" to the game and will die hating TFP for removing it until with their last breath they utter a curse at Madmole just cannot be the majority. I don't believe it. I do agree with you that we won't fully know the repercussions of all these changes until the final 17.x or possibly A18 and see whether people come back to see and then stay. A17 was the first release where the overall number of players did not break all previous records but the high plateau above 20k is a new record so who can say what it all really means.