My .2cents.
I agree whole heartily that the 6 sided ring has somewhat been an identity of TNA, and everyone gets that. It's obviously been made for gimmick matches and for high flyers. That's great and all and it worked but if TNA wants to stand up to the WWE and put their wrestling on the line, they must cut out the gimmick matches and wrestle in a traditional ring. Some say it makes them stand out, but I think they stand out to being fruity.
The only problem is, is that it looks HIDEOUS, RIDICULOUS and JUVENILE. When I first watched TNA, I almost couldn't watch it because the ring was tiny and looked awkward as it was. To the new fan tuning in, I can almost guarantee that the 6 sided ring would turn them off. These are grown men in there, specimen's. They need their room, and guys like Sting, Angle, Abyss, and even Daniels and Styles can do SO MUCH MORE and put on a more original match given their talents if they go to a standard 4 sided ring. The small ring limits talent. Tune in to the WWE, and you see those guys in a huge ring and it feels more like WRESTLING as we know it. Always will.
I know MOST TNA fans love it and wouldn't want them to get rid of it, but I think, overall, and to the overall feel factor, that TNA would benefit going to what wrestling is revolutionized after and that's a 4 sided ring.