The main problem is that he wouldn't be able to do anything in the dorm, managerial wise. Of course, you have to wonder why is he coming back?
Is it for a cure, probably not.
Your sarcasm holds a ring of truth. Some studies suggest that confronting your phobia's head-on
can be a very effective treatment.
And you could always give Keitaro some credit. It takes a seriously advanced set of skills to do some
of the repairs that he's been seen doing. Electrictian, carpenter, woodworker, ability to lay masonry.
And that's just the stuff we've
seen him do. It's highly possible that he
has to come back because
he's the only one that can do all of that, and do it
free of charge. Some of those things, especially
the electrical work and laying/repairing stonework, tend to run
very high as far as cost is concerned.
It may very well be that they either they get Keitaro back, or all of their rent's have to be raised
to afford the repairs. That's money that some of them, especially Mitusne, probably don't have.
And in the end, it's not about whether or not he need's them. It's that they may very well need
him. After all, you never know what you have until it's gone, and I bet a few days of having to
put up with gaping holes in the walls and ceiling from Motoko having accidents while practicing
would wear on one's patience.
And that goes double if it's winter and/or they get constant, heavy rain. Sucks to be them.