I'll be very surprised if he's not dead at the very end. Consider the following: we will have the purity routes for every girl just to lead to the so called "one true ending". What can this entail exactly? A Harem ending is absolutely discarded... it can't be either an ending with his "one true love", that's what the purity routes are for (unless Selebus reeeally wants to play favorites here), if he can't have all the girls he won't get any.
So, we are left with: a) a straight bad ending (where he's dead, a slave for eternity or whatever you want to imagine); or b) bittersweet endings, like the girls breaking the cycle and being able to finally move on from him. The question is, can some of them really do that if he's still around? I doubt it. Also, him being alone forever wouldn't make sense either. Therefore, he needs to go. Sorry, it's not like I'm trying to get you worried over your other favorite character... really, I'm a nice guy... unlike that hexadecimal bastard. But imo his chances of surviving are very slim. I think his passing would force the girls to either move forward or get stuck in their grievings, I can see a few trying to wish him back at the end (Maya among them).
Or maybe...