Already many have made suggestions other than crafting making all level 100 gear. The post above yours for example makes a suggestion that different high level equipment should come from different content, which is a fine suggestion that would keep every level of content relevant rather than just a few.
I mentioned this earlier but I'll mention it again. Having high level equipment coming from multiple levels of content would give players more ways to obtain that high level equipment after they run the grand total of one end game instance and cap your tomes for the week. Having some (not all) of the high level equipment in the game being rare, highly sought after, and crafted wouldn't give people less things to do. It would actually give them more things to do, as it would provide an alternative to work on after you participate in dungeon/raid activity. Players who want multiple options for high level equipment aren't asking to skip content, they're asking for more content to be relevant. No one is saying "high level equipment should be 100% crafted, 0% dungeons," they're saying both should be relevant. Raiders who think all other content should be irrelevant are the ones asking to skip content. People who think that i90 progression for the week would better consist of "Run your instances and cap tomes for the week and log off" are far lazier than people who would be willing to dedicate the time to participating in all the content that the game has to offer even if it wasn't as time efficient, and not limit yourself to raid content and nothing else in terms of progression.