I wouldn't like to see gameplay restricted based on skill levels, or anything actually. If friends wish to play with each other, Ranked or Social, then allow them to do so. However that is completely irrelevant because there isn't going to be 2 distinguished Ranking indicators. Though I do actually like the rest of your idea, I perhaps feel the 1-50 is gone for good now.
However, generally what concerns me, and the reason why I ultimately registered is some other opinions I have been looking at. I've read that people feel a system which rewards Ranking Points based on your own personal skill during the game (K/D, Headshots, Sprees...) would be most beneficial. However such system is still completely flawed.
The first thing I loved about Halo 3 was Big Team Battle, it was absolute carnage and I played it a lot, as I do on Halo Reach. The main difference between the 2 is that on Halo Reach the games are relatively dull, there is no atmosphere, competitiveness etc because people learned to play by themselves. Contrary, I feel the Trueskill system on Halo 3; though manipulated, brought the general community closer together as people felt more obliged to cooperate to win, as you needed to actually win. It naturally had a knock on effect into Social games, not necessarily in a serious way, but in a good way for laughs.
I have no in-depth opinion or solution but I would merely suggest keeping the Halo Reach Ranks virtually identical. In terms of merging in the Halo 3 system, create the Individual Rank for each Playlist with the Trueskill hidden for Matchmaking purposes (Hinted already?) The big factor would then be centered around how EXP is received, and as someone who enjoyed the competitiveness of Halo 3 I would suggest something along the lines of:
- Winning EXP based on how you perform in the game + bonus for winning.
- Losing, a set amount of EXP is automatically lost, however is reduced depending on how well you perform in the game (I.E if you lost 3000 credits but anchored your team with a high K/D, Headshots etc then the penalty would be reduced)
It wouldn't solve everything I addressed, but there would be actual purpose in winning again which in turn would hopefully make games more fun. Furthermore it would combine personal Skill with Teamwork which would be nice to see. If anyone feels it would potentially be a good solution, I'd be happy to elaborate further to address all the issues.