@dharman For manga adaptations, sure, but for most part expect them to leave stuff out, or end prematurely. Those are the lucky ones, those who are not go on hiatus, or are simply axed outright(I'm looking at you
Ubau Mono Ubawareru Mono..).
For when we reach a point in time when the amount of isekai
novels ending balances those that are starting, I haven't the slightest clue...