Glyphs have been getting nerfed or cut entirely since its introduction back in Wrath. Nerfs done through no direct fault of the profession itself. Kinda makes you wonder if Blizz should just remove the profession entirely and just let players buy Glyphs with gold.
When Inscription was first introduced, Glyphs were the main reason to run this class followed by powerful situational enchantments exclusive to the profession. The profession has clearly been moving away from Glyphs while trying to remain relevant. I think the MoP flying mounts were the most unique things you could make with the profession for those who worked toward them.
Now...you really can't help but wonder if the profesion will be around after Legion. Its main purpose for being has been undermined from the beginning while everything else is done better by other professions. What motivation does someone have to roll Inscription now? I Say this as someone who has rolled an inscription alt every expansion. If Inscription doesn't get any love next expansion, I'll take it as a sign it's no longer viable I guess.