The closest Marvel has come to the situation you describe was in the 1960s when the number of titles was capped due to a distribution deal they had with DC. Once they got a new distribution deal, the number of titles expanded. You are expecting Marvel and other publishers to limit titles that are profitable. This is not a realistic expectation.
At the end of the day, you need to remember the MST3K mantra. "Just repeat to yourself, it's just a show (or comic). I should really just relax."
And if Peter Parker is still Spider-Man, then what does it matter that there is a Spider Gwen, Miles Morales, or Miguel O'Hara title? Can't you stick with the classic Amazing title and just enjoy it? Is the quality of ASM affected by the mere existence of other titles? Can't you just read the titles you like and ignore the ones you don't?
Remember the end of HOM lead to the resurrections of Hawkeye and her twin boys. Maybe in her subconsciousness she wanted her friend and children back and not want to be Mageto's child anymore?
Maybe post-HOM Wanda and Pietro is the same case as Billy and Tommy? They are reincarnations of pre-HOM twins, with the same soul but different parents.
i want a pietro and wanda incest run, so hot.
I could tell they were all over each other in Avengers Ultron. ... %)