No. I see limited prospects for growth in the professional wrestling industry.
You don't buy stock to support the home team, you buy stock because you expect people will later want to pay you more for it than you bought it for.
Would TNA/IW be any 'better' as a publicly traded company? You're assuming that by becoming publicly traded, the people that own shares would have an influential say in how the business is run. This is wrong. An IPO for TNA/IW would be a cash windfall for the Carters and Panda Energy, but they wouldn't have to sell a majority interest. The McMahons own ~70% of WWE stock, but control 97% of voting rights. While they are a publicly traded company subject to financial disclosure laws, Vince McMahon retains control of the company. Being public or private wouldn't matter much for TNA/IW, besides having to post their financial results- which I think is a key factor in their remaining private.