While I would love a larger iPad pro, I wouldn't want to give up an 11in pro, unless apple makes a 9in iPad mini pro.
I like having the 3 sizes, but sometimes I use the 11" instead of the mini simply because of some pro features missing on the mini, like quad speakers (if the mini had it I would have taken the mini) or even just more RAM.
So I like the fact that we have a very compact pro and I wouldn't be agaist an even smaller one, but I talk as someone who doesn't need to compromise by chosing one size since I'll get all the sizes anyway...