I say they've got to keep the 6 Sided Ring, other than the X-Division which really hasn't meant anything in a while, it's the only thing that really sets TNA as a unique and different wrestling company. First time ever viewers are drawn in by the 6 sided ring, it's different and it's fresh as well as really never seen before.
I actually agree with everything you said, but just small knowledge, I believe they got the idea of the 6 sided ring from Mexico's AAA who were the first to use it and have been using it (along with the 4 sided ring) for years before TNA came around.