Well, Disney announced today that it has no plans to remove the R rated Marvel films coming up, biggest of which being Deadpool. I dont see why Disney would do the same to the Alien franchise. There was a good point made about merchandising and such being limited on R rated films, however, there are already so many brands out there making toys and other "fan boy" goods from R rated series like Aliens, Terminator, Predator etc that I doubt it will have any drastic ramifications in Disneys mind to change the rating of some of the most beloved franchises around. Given the Aliens franchise has amassed such a huge following its 30 years of existence, it would be a bit of a silly thing to mess with the standard rating of the films (we all saw what happened with AvP because of it).
I genuinely hope that Disney gets behind the Aliens franchise like it did with Star Wars. Though the Aliens franchise isnt quite as big as Star Wars, its still a lucrative and good investment choice for Disney to come in and put some money and new talent behind. Personally I believe that Disney shoudl let Scott finish out his trilogy of films, then get Neil Blomkamp back in the picture and have him make his Alien 5 film. There were A LOT of people out there (myslef included) who were VERY excited to see Blomkamps film become a reality, if nothing more to see him PROPERLY close out the Ripley storyline. It would make sense to allow Scott to finish his trilogy as well as allow for the Blomkamp Alien 5 to be made as BOTH films would tie up 2 storylines neatly and nicely... then allow for additional Aliens films to be produced that exist in the same universe, but have nothing to do with the David/Ripley storylines (much like the comic books and novels have done for decades that STILL continue to sell well to this day).