I wonder how jewelry crafting will be handled after the 2019 chapter goes live. It's possible that Zenimax makes no changes to how you can access it, but that seems unlikely. If Summerset is added to ESO+ then jewelry crafting becomes a perk of the sub.
However, they can separate it from the story/zone as they did with a couple of things from Morrowind. The options then would be a free addition to the base game like with battlegrounds or a buy it separately model like with the Warden.
Personally, I'd like to see it added to the base game even though it was a priority reason for my purchase of Summerset. What do you think will happen and more importantly, what do you think should happen with jewelry crafting?
Only six more months until the next chapter, not too early to start thinking about it.