IMO it's not the car designs or manufacturers people should be looking at, the current trend for experimenting with new chassis layouts is more down to the track surfaces we're running on these days. Take away the stupid velcro like astroturf that seems to get put down now when tracks get resurfaced and you eliminate the need for different chassis layouts.
From what I've seen of the mid-mid motor 2wd's they're only any use on the highest grip surfaces and are very track specific, if the grip isn't quite high enough they can make good qualifying cars but aren't very good 'racing' cars. You have to drive very swoopy lines and keep your speed up, much like when 4wd's started moving from one way front diffs to full time 4wd it can be very easy with a traditional mid motor to point and squirt up the inside of someone driving a mid-mid.
Personally I don't think there should be any rules introduced to specifically rule out any potential 2wd layout, as long as it only has two wheels driven let your imagination cook up anything!
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