That means I win. \

/
There's a potentially huge market for an iPad Pro. No, it won't sell as much as the Air and Mini. It'll cost too much and be a little too big to have the mass appeal of the smaller tablets. But there is still a big group of people who want a tablet to do something more besides light work and browsing on, and they'll buy an iPad Pro if they find it addresses their wants and needs.
Because if Apple doesn't do it, someone else will. Hell, there's already tons of companies out there making inroads into that market. The Surface Pro is a lot closer to the ideal concept of a heavy work tablet than the iPad currently is.