Thats not the same, TNA would still have him as an on-screen character. I'm far from the only TNA fan that knows how great AJ is, he carries the company. It's not that they are in bad shape w.o him, but he is what keeps the company financially stable, I remember a few years back TNA ran a show in Westbury NY, and my friends and I only decided to go because AJ was on the card. Again a year ago, only because AJ was on the card. My other friends that enjoy wrestling are mainly WWE fans and only watch TNA for AJ Styles, Jeff Hardy, RVD & Kurt Angle.
AJ Styles is a draw, and most likely no mater what WWE offers him he would turn it down if Vince was in charge, if HHH was in charge he would probably go and probably be used properly.
If you ever go to a TNA live event, which I highly recommend as they usually have 5 or so great matches and it costs you around $15-20 bucks depending where it is, you'll see. The crowd always goes NUTS for AJ Styles, everytime i've seen TNA Live, AJ gets the biggest pop by a mile, except when they had him as a heel/stupid Prince AJ gimmick under King Angle, which was absolutely idiotic. He still received one of the biggest pops of the night, second only to Samoa Joe.