You seem to forgot the most important thing, people... NEGI'S FATHER. Seriously! So we are to believe Negi died without finding him? I know it's a minor subplot that's been going on only since THE BEGINNING OF THE SERIES and was mentioned in just all of the chapters but still - wouldn't it be nice to see it resolved?
But all in all - this series is very very bad. Leaving aside the protagonist's age - totally not matching either the "saving the world" part or the "girls drooling all over him" part - there are too many things unexplained, like the whole Negi's plan to save the magic world (meaning: all the latest chapters) and the changes from superdrama to silly ecchi harem comedy (again, the guy's too little, it's literally disgusting) are just to sudden and unreasonable.
My guess - Asuna will meet with Negi somehow after all. The author shouldn't have much trouble with him being dead, I mean stupid readers have already bought much more of the stupid, nonsensical "magic needs no explanation" sh*t, right? Also we'll learn Negi met with his father at last - though since there are three chapters left, don't hope for a good explanation where he was and what he was doing all this time.
Have I mentioned this series is stupid and makes no sense?