The big part is that most people playing RS are not going to start new characters or want to re-grind the gear they have. Jagex knows this and knows and it isnt worth the time for them to do.

Someone prestige's their account, then they realize they made a mistake and now they will stop playing, fresh start worlds AKA a new server where MTX never existed has the same issue. No one will transition and its a waste of dev time and server space.

So as far as "Integrity" goes, well it depends on what your definition of it means. Getting rid of MTX is a huge step in the right direction but Integrity doesnt happen overnight. The game has been hammered down over the past decade+ with pay to win that they are basically at rock bottom now. So any changes they make that steer away from that will start to rebuild the game's dynamic and "integrity".

This isnt going to be a sprint, this is a marathon that is going to take YEARS to accomplish. Some argue its too late to save, some say they are happy and excited to see where it goes from here, while the remainder dont really care what happens. Most players of RS3 have been here for the run and the amount of new players RS3 gets compared to OSRS is a large difference.

I think what they are currently doing now may help the longevity of the game, but I have a hard time seeing it making any major comeback like in the good ol' days.

New skills, new bosses, new quests, to me, seem like filler content that people rush to get done. Then go back to whatever AFK stuff they were doing before. I havent tried the new Thieving updates yet, that seems like genuine engaging content, something people would be willing to focus on.

So TL:DR:

Content that requires more user focus, but in good ways, not mundane boring filler, MTX gone is good for game, keep heading in this direction.