Mistwell said:So what effect would the spell have on a normal spellbook, given there is nothing specifically magical about the pages in either a blessed book or a normal spellbook, or the spells in either (just the process of writing spells into it)?
Okay, the normal spellbook would be completely unaffected as nothing I am aware of makes it susceptable to either dispel magic or disjunction effects (nor is there any reason to strongly suspect that it would be). The default way to interpret the Blessed Book involves both magical scribing (lower cost) as well as display (1000 pages in one inch). You lose the ability to scribe for less and I'd be pretty skeptical that you'd be able to read the resulting pages as the disply function is gone too.
A very generous approach would be to hav the spellbook transform into a non-magical 1000 page book and be quite cumbersome. I think this is against the most logical interpretation of the magical elements involved. However, since RAW is vague on the point, I'd not argue that anybody with this view was actually incorrect.