Since
Power-Ups 2:Perks collected together all the perks in 4th edition titles, there's precedent for the release of a convenient compilation of these creature descriptions.
Add my voice to any clamor for such a single book or PDF. As Banestorm and DF aren't my cup of tea, I'm unlikely to buy several of the books in which these monsters originally appeared, but I'd happily pay for a single PDF containing all these stats.
Of course, we don't know what's in store for the DF Bestiary project. It could be a compilation with plenty of new material thrown in.