Exactly why Vincent should prop it up. Doesn't appear to be a threat, so it'll be an easy sell.
I don't get your logic. Even when TNA was in its prime it still didn't really touch WWE in ratings and didn't stop WWE from getting super complacent with everything. Vince propping up TNA isn't going to change a thing.
If Vince throws money at TNA it will literally only be to put new content on the WWE Network, and maybe get a few other wrestlers.