Yes, if you're going wireless, theoretically, everything should be wireless, including the mic pre's, theoretically, of course. If I use the school's system again next school year, I will have to keep the DL close and tune the room wirelessly when needed.
Long & McQuade here is already taking pre-orders for the Behringer X18. It might be time to take a long hard look at this one again. They posted a retail price of $999.99 Canadian for it, with a minimum 30 day ship date. It would be nice to play with the software first. I presume the X32 app would fill the bill for learning my way around it until the X18 software app is released.