Ummmm....where were you two years ago when TNA tried to do just this very thing and failed miserably????
When Hulk Hogan debuted in TNA on January 4th, 2010, TNA went head to head with WWE. They garnered a 1.5 rating and an audience of 2.2 million viewers, which remains the largest viewing in TNA history. Soon after, TNA moved to Monday nights opposite Raw to compete with WWE and proceeded to get slaughtered week after week. The ratings grew so bad that TNA moved to Tuesday nights to avoid competing with Raw and continued to lose viewers. On average, TNA has tended to draw about 1.5 million viewers each week for the past several years. By the middle of 2010, TNA lost nearly 50% of its viewers in its attempt to move from Thursday nights and it didn't help that the TNA product was one huge, stinking turd. Spike eventually moved the show back to its Thursday night timeslot and TNA spent the rest of the year slowly building back the viewers that they lost.
TNA can't compete with WWE. They don't have the audience, they don't have the finances to "lure away" top WWE stars and they don't have the resources. TNA isn't WCW. At its weakest in terms of audience & resources, WCW was still far above TNA has ever been. On top of that, stars just can't be "lured" away to rival companies anymore due to contract signings & 90 day no compete clauses in said contracts, both TNA & WWE have them.
TNA bragadociously declared "war" on WWE, in Hogan's on words. TNA took a shot at competing head to head with WWE, they gave it their best shot but they got their asses handed to them.