If Purdue lands Bell, Robinson, and Weaver I am saying right now, they make a final four. Way too much talent all over and four years to develop it all together. Robinson is a ridiculous talent and having him with Bell and Moore on the field at the same time means they won't be able to double them all. The numbers would be insane. Couple that with arguably Purdue's best defensive class ever? I would say it would be the best shot Purdue has had at a title in recent memory.
I also think that would be a very very hard situation for Brohm to walk away from. He has everything he needs right here at a school.
Side note, I think Purdue is the only school recruiting him as an RB, though he would also be catching a lot of passes too. I think Purdue absolutely gives him the most touches.