I think it's the nature of things that your gear-based progression will end quicker if you opt out of the higher end play. (even mythic raiders run out of effective gear, some of them rather quickly as well).
As far as the gear itself, I feel like the game currently does a reasonable job in guaranteeing AP, while not guaranteeing gear. Things are still worth doing when presented with a situation like that.... take heroic dungeons as an example. I still run them daily for AP, though realistically I completely outgear them.
In terms of not 'needing' gear if you aren't doing various types of content.... to me, gear always makes the interesting part of the non-instanced game that much smaller. At some point you get to a stage where the only places out in the world you need to be cautious in are eastern Suramar, and the 4 surrounding isles (one of which isn't even worth messing around with). Everything else poses no threat, and when the game gets to that point, the 'chore' aspect kicks in.
Perhaps later on down the road they'll offer something like this. They certainly don't seem concerned with alts right now. I'm not either, but I can understand folks who enjoy that style of play.