Information on LAS
First of all, I would think that the airport authority would want airline lounges in the airport as they have built two spaces in the D gates for them. One was previously run by National Airlines before they went under. The other was built out when the new addition to the D Gates was built. In addition, the US Lounge is moving to behind security from its previous locaion before security. All thisleads me to think that the airport authority does want these lounges in place.
As to the OW getting the lounge and an AC coming. I can't speak to that, but I do know that CO is looking at putting a PClub in the D Gates. I am sure if that happens that those with Priority pass will be welcome.