Exactly this. In fact, lets take this to the extreme. Lets say killing Zekky 8 times was even MORE lucrative than it is now, by not only dropping hero gear and gilded crests each time you killed him, but also myth track gear in the vault. A month in, a person could conceivably have full myth track gear (with some crappy trinkets, but myth track ones). What then? Would they stop playing the game? No. It’s more likely they would then try out more demanding content. They’d probably try M+ and raiding.
What’s the catch then? Well, they still have to perform to be able to participate in the highest levels of content. Gear will only get you so far. The elite clubs are still safe.