Furious, perk points aren't very useful now, I'll grant you that. Some people won't fly the perk planes because they aren't that much better than the free planes, and they don't seem like a good 'investment' of perk points.
That said, most of the people that don't like the perk planes might like them more if losing one wasn't such a 'big deal'. Some people don't like losing perk points, and usually all of the perk planes are so rare that if you do take one, you end up fighting every enemy in the area while the friendly planes are all wondering what happened to their fights. Some people have flown the perk planes, and have decided purely on performance that they don't really like them that much. I'm one of those people, maybe you are too.
Now, I think changing the ENY system to a purely proportional system would do two things. First, it would lead to a greater number of perk planes flying around. Hopefully, it would lead to a greater number of perk planes actually fighting, since if you lose your plane you can get another one really easily. HTC, for whatever reason, has set the 'bar' for free plane performance at the La-7. None of the free planes are better all around (for fighting anyway) than the La-7. Furthermore, only the Tempest has anything like the performance the La-7 has as a perk plane. The Spit 14 is to slow to catch one, so is the F4U-4 (although it is a lot closer), and the Ta-152 isn't even close. So all of these perk planes flying around won't be that great a disruption to the current Big 4 type fliers. They will, however, give similar performance to the P-51 or La-7, depending on which plane you pick, but instead of seeing yet another P-51/La-7, you'll get to fight a F4U-4 or Tempest.
Second, I think it would lead to an increased number of 'under-utilized" planes being flown. Depending on how much someone wants to fly some perk plane, they might go with a middle of the road plane like the La-5 or the 109G-2, or a completely ununsed plane like the C202 or P-40. Either way, diversity in the MA will increase on that end. By the way, apparently you and your squadmates have a much lower opinion of the average pilot than me and my 'elitist' supporters. You and Dejavu seem to think that nobody except the very best pilots can get kills in anything but an La-7/P-51/N1K/Spit, which is patently untrue.