I am on topic, your words:
"Here's hoping that trial cap gets raised to 25 so everyone can exprience glyphs"
That sentence took up most of your post and I am addressing it. If your own OP is "off-topic" then why the hell is it the OP.
NO, it does not make financial sense for them to raise the trial cap to 25 so everyone can experience glyphs. What DOES make financial sense is for blizzard to look at how many f2ps there still are, and take more steps to encourage those f2ps to become paid subscribers, including deliberately placing things like glyphs and spells just out of their (f2p) reach.