I 100% agree with your comments. However, the main issue (for me) isn't the difficulty of getting out of Carbonite. As you say, if you're ready to get out of Carbonite, you'll get out of Carbonite.
However, its the interactive experience of the matches in low Carbonite. How bad is it if your first match is vs a 10 million GP account that probably won't play. How are you supposed to have a competitive battle vs a 2 GL front wall defence when you're account has only just become eligible? It's all very well being promoted to the point where you're playing up a large amount of GP, that's WAI. However, how do players feel when they're winning C5 matches 10-0. This is what needs rectified.