The way it'll probably be in the future is that RME will be the best weapon some of the time and merely a good option at others, depending on what events SE releases.

Right now I would expect more and more competitive weapons to be released up until ilvl is inevitably increased. At that point, there will probably be weapons that are clearly better than 119 RMEs. Then sometime after that, SE will introduce a way to upgrade RMEs to whatever the current ilvl is and they will be the best for awhile. And so on.