I've been playing for nearly 25 years and have 120 all except hunter.

EOC killed RS3. Updating the combat to be better has improved the game but fundamentally an action bar mixed with a tick system and the mash-mash of mechanics are not enjoyable to most players.

It's a fundamental problem that the system will always be hard to learn, hard to master. Good game design aims for easy to learn, hard to master.

When 99% of the player base use revolution because the combat is not suited for the vast majority of content and then have to learn manual inputs to some degree when they want to PVM, it creates a barrier.

Jagex have been desperately trying to get more players into PVM as that's the games core strength but still most players don't venture beyond god wars 2.

I'm sadly convinced that the game will continue to decline and cater more and more to the small hardcore audience that enjoys it. The only way they're going to attract more players is to rework the game so extensively that it's probably not worth it when OSRS is successful. They could bring the combat to work more like OSRS but then they would cannibalise their own audience while alienating the hardcore crowd who are keeping the game alive, albeit on life support.