There is no "proposed ruling". There is a bill in Congress with one set of rules, and there is an AOPA/EAA petition with a very different set. What the FAA will actually put forward is not yet known outside the FAA, and even there, it might not be finalized.
There are a lot of Experimental 2-seaters which those folks are not allowed to fly. Those folks are limited to LSA's, and there are plenty of non-LSA EXP's.
In any event, the Rec Pilot rules have been around for like 20 years, and they've always allowed Rec Pilots to fly 4-seaters as long as no more than two seats are occupied. Since the FAA has found it possible to make and enforce such a rule for Rec Pilots, there's no reason why the FAA could not do the same for PP's with only a DL for a medical (if that's what the FAA chooses to do, and we don't know yet the details of what they are looking to do).