My understanding is TNA had zero advance notice about ROH coming aboard. If that's the case, how can this possibly be a good thing for them?
Honestly, I don't think it is either.
The Lawful Good Idealist in me hopes that it's a sign DA is welcoming more wrestling.
The Realist in me realizes this is a cost-cutting move. It's not that ROH is "better", it's that it's cheaper. If they can get a modest audience at a fraction of the cost, that's what they'll do.
Keller and Jim Ross have pointed out they believe DA wanted to book TNA. If ROH is a success, I think a similar thing could happen with them too, the network will want control of the wrestling company, and that never ends well. Heck it's already happened with Sinclair and ROH.
If anything TNA is proving how difficult it is to run a national wrestling company. Vince has been the only one who's been able to do it for any sustained length of time.