Personaly I would be happy with the proposal, but it looks like there's some concern about network security, as it's expressed by @smooth
Dan is suggesting more complex solution, quoting reference

To summarize the proposal my suggestion for community to review is to divide the 21 producers into 4 categories:
8 — STAKE²
8 — DAYS * STAKE²
3 — RAM
2 — (AVG BURN/DAY)²
Electoral College
Rather than producers having to choose one of these categories and limiting the number of slots to 21, the network could select 100 delegates and then use approval voting of 1-vote per delegate to select 21 block producers. This added level of indirection gives people more voice without sacrificing blockchain performance and prevents producers from having to pick a category.