I genuinely think Apple will drop the Pro line soon with the line up shifting to a more capable 'cheap' iPad and an iPad priced somewhere between the current Air and Pro available in multiple sizes from mini to 14". Or maybe the Air is dropped with just the 'cheap' iPad and a slightly more affordable Pro continuing.
There's just too much duplication in the line up, the 11" Air and Pro in particular.
The reality is Apple is selling less iPads while at the same time making more versions of them than ever. Some streamlining and focus is needed.