There's a reason the 13 inch macbook pro is your best selling macbook. It's the best price/performance ratio and relatively low cost in comparison to the rest of the lineup.
I too think it's a risky strategy by Apple. 13" MacBook was their mainstream product along the 13"MBP...both now seem to be replaced by the MBAs. But for example an ODD is still strong mainstream. Now the MBA + rMBP doesn't offer that anymore..the rMBP is waaay too pricey anyway. I can see a lot of people turning away or buying a 13"cMBP, but that's about to be killed quite soon we'd all guess and looks already outdated in comparison (to the general public anyway).
Pesonal story: want a capable machine for some 3d/CAD/PS stuff to replace my PC desktop (or MBA as well). But nothing fancy at all.
Waited for the MacPro update - nada
Looked at the mini '11 - nada (no 4c and dGPU)
Looked at the rMBP "15 - nada (but that was a close one, ordered already but canceled because of IR and general RevA issues - call me a sissy if you'd like to)
Looked at the mini '12 - nada (see above)
Looked at the iMac'12 - nada (have a beautiful ACD and that wouldn't work well with a 2013 MacPro refresh - here's hoping...)
That is one really tedious story to find a normal product that is kind of fitting nowadays from apple (for me). Don't think it has to be that hard. The cMBP 15" seems like the logical decision, but since I know what is possible with a retina (screen-estate!) I'll wait for the next revision.