Obviously there needs to be other tweaks (recall I agree the multiplier for Northelm should be increased and started by linking to another poster’s suggestions about ways to resolve the issue but still leaving the caps in place). This would go along well with my previous suggestion!
Legendary Northelm then would at least provide ~150 gear cap (assuming 3x instead of 2x) after 5 playthroughs. Of course the buff could be more like some of the ideas mentioned but there also must be something to play towards and right now there is no value in Mythic evolution, hence my addition to the overall conversation.
(I realize that they put in the whole “Here’s a way to use all those Eveline Crystals now” but they could also go with increasing the Crystals awarded to 4 instead of 3. More than one way to skin a cat!)
One other point:
I actually think this is less of an issue currently for newer players. Even with my Northelm at Rare (25) I’m no where near the cap (on my replay account) given the amount of salvaging that is done and the lower quality of rewards. Better incrementing as players play longer and attain higher levels (Northelm multiplier, Citadel bonus, etc.) is the more likely way to resolve the issue.
Finally, the obvious solution is remove the gear cap entirely but I’m pretty confident they have no interest in doing that 