This question is market specific but in the States, JBJ doesn't hold up like the Bon Jovi name does. It's like this with other bands as well. For example Vince and Motley are not one in the same.

I don't think Jon touring under his own name is a risk they are willing to take. Unless he had a real guitar player to help carry his name... Example, JBJ with Slash on guitar but that is even a long shot.

Think of it this way too... If he brings along Tico, Dave and even Huey, it really doesn't make sense to call it the JBJ band... If he totally goes solo with all different players, then the band songs will lose something with other people playing them. They won't sound like Bon Jovi, more room for mistakes, and much more work for Jon. He needs Dave. Not only for his keys but vocals and other things as well. It would be so much work for Jon to try and mold new guys into their sound. As much as Phil adds on certain things, it's obvious what he lacks on others.