Last night, I had an invite on Skype from one of the fine folks that grabbed up my AH Gold Guide. Core had a question, and after answering, I thought I better hit on it in case there are others out there wondering the same thing. "Ask Alto" is one of the bonuses/perks that come with purchasing the guide- In other words, you ask, I answer. That's customer service there! =)
Core asked about what he should do with his Books of Glyph Mastery since the change is coming where the books are no longer needed. Well, kinda....The "learned" glyphs will still be taught with the Books, but they are being added into what is estimated to be a daily research "quest", whether it's Northrend Research or a new one all together. Whatever is decided, we are left with a conundrum here....
Part of my answer to Core was a question: Would you rather pay for a book (no cooldown) or do dailies? There are near 50+ glyphs that can be taught by the Book of Glyph Mastery, and when they go to dailies, well.....that's quite a few dailies to get all of them (and they are some of the most "profitable" glyphs out there---for the most part). I think most folks would do a mix of the two to get these glyphs, so there is still a or "want" for the no-cooldown option (notice I didn't mention "need"?).
What am I gonna do? Not a damn thing different than what I am currently doing. No change. I will still flip them, as there are always folks that have more gold than time.
In case you were wondering where and why this is being talked about, here's a little insight: A question Blizzard posted on a Ask the Dev's:
Will you provide a way to speed up the acquiring of glyphs usually acquired through research and glyph books? Glyph books (Book of Glyph Mastery) are hard to come by now that people spend so little time in WotLK content. - Furlqt (NA/ANZ), 에르네스트린덴만 (KR), Kånê (EU-ES)
- Yes. We will be changing the discovery spells so they can teach all possible glyphs, and the books will simply provide a no-cooldown method to do the same thing.


233 from Trainers, only 221 true "recipes" [2 researches, 4 masters inscriptions, 6 levels of inscription]
205 from Discovery [66 Minor, 83 Northrend, 57 Glyph Mastery]
1 Drop
3 Vendor
Note: This is just the math of it; I have yet to see for myself in Books of Glyph Mastery will let you learn Glyphs other than those available only to Glyph Mastery if you haven't learned all the discovery ones.
At the very least, you can learn the 221 trainer, 3 vendor, 57 Mastery, 1 Drop, and 1 of each Research glyphs.
Edit: yes, it appears to be feasible that you can learn all the glyphs from Books of Glyph Mastery. On my Inscriptionist, I had 29 Books of Glyph Mastery to use, the day I hit Northrend Inscription, so I had only used Northrend Inscription Research once, and though I've used Minor Research multiple times, I haven't learned all the Minor Glyphs. After using my books, I had learned 3 NIR Glyphs (Lifebloom, Trueshot Aura, Holy Wrath), two of which were from the books, one from research, and a few minors, most notably Pestilence.