Before I started doing Crafting Writs, I had Style Gems coming out of my ears. I destroyed 100 stacks like nobodies business because I could not give them away. Now, I am running out of them doing crafting writs.
With the Exception of Dwemer Frames, which, are hard enough to farm that I've NEVER seen anyone wearing Dwemer, Style materials are just bank clutter, most people keep a stack of 100 in their bank that just builds up from hirelings/deconstructing, and then deletes any others they get. They're useless to sell because you get so many they're in almost every container and hireling and from deconstructing, and if you really ran out you can buy them cheap from NPC's, so everyone just deletes any that are over that stack of 100. It gets to be a hassle with inventory management because they just pile up and are essentially junk.
IMO finding/buying the motif is enough, we already have mats for traits so you have your base mat, your trait mat, and your 4 levels of refining mats, that's enough for crafting. Adding the style mat in there too is just excessive and a pain for managing inventory/bank.
If you won't remove them explain WHY you feel they're an important part of the crafting system, because I think your playerbase will disagree.
Reason so few were Dwemer is because the freaking motif is Rare and its in a zillion chapters instead of just one book. Not even going to try for that style until it drops as a whole book or they lower the crown store cost to something more sane.
Remove them from merchants and lower a bit from dez (don't give style stone for white items).
Then we'll have a new market.