WWE dominates TNA in terms of ratings and attendance, but Impact Wrestling isn't the joke it used to be. WWE Raw could certainly borrow some of Impact's best aspects.
Some fans still have an image of TNA faltering every week, of too much Ric Flair and Hulk Hogan and Jeff Jarrett. With Vince Russo and Eric Bischoff involved, Impact sometimes felt like a continuation of WCW Nitro's worst years.
The show has grown and evolved since then.
Impact has found its own identity and is thriving in terms of wrestling and entertainment quality. It, like any wrestling show, is still a flawed product, but it has been successful on many levels.
It wouldn't hurt for the Raw writers to take notes on what TNA is doing.