Finally got to read volume 15 of the manga today. It was very nice to finally have Negima's ending be properly explained and expanded upon, not just in words, but actually showing us everything that happened (though to my great annoyance we still don't get to know/see what the hell happened to Negi's mom...I sometimes wonder if Akamatsu has forgotten all about her...). I feel like I don't even really need UQ Holder's future ending anymore, since, if they're not going to "cheat", as Touta calls it, then, to me at least, it's literally impossible for any ending to UQ Holder's story and timeline to be better than Negima's now perfect happy ending. I'll still keep reading it and enjoy it though, of course.
It really really sucks that we can apparently never have proper anime adaptations of Negima and UQ Holder that are at least half decent, and not utter shit gutter abysmal, but at least I have the mangas...