
Fox own the rights to both Franchises and i think they would still carry on by giving us a few more Alien movies and few more Predator.... but i think they would also bring out another AVP its only a matter of time.
I think we can accept each has its own Franchise, but then a AVP could be a non-canon alternative and i think AVP could work if it was done within the context of the Video Games... i.e we are looking at being set either in the year 2200+ or around 2150 could work too... they missed the boat by bringing the Aliens more into the Predator Franchise... as opposed to the other way around...
They could have instead even had connected the Space Jockey into the Plot before Prometheus had hit the Scene..... but they went for the set on Earth in the 21st Century and it just never worked... apart from Pop Corn Xenos killing Predators and Vice Versa while both killing Humans etc.
R.I.P Sox 01/01/2006 - 11/10/2017

I agree, I think the Alien and Predator should remain separate,cinematically, unless they went the route of the original Dark Horse Comics series. Fans have been begging for a film adaptation of that series since they were released. It's really the only way the two franchises could merge without being lame and unbelievable.