I turn Impact on at work sometimes and anytime someone happens by the TV, no one has ever even mentioned the 6 sided ring.
In fact, I went to BFG in Detroit with 2 people who aren't really even wrestling fans and they didn't seem to care either. The only reason they went actually is because the TNA guys do more fast and high spots than WWE does. I've found that the high impact moves draws people to the product. And that the ring doesn't detract any of them from it.