Before I start, I just want to say up front that this is all just my opinion and anyone should feel free to agree or disagree with me.
The problem in rereleasing old beasts actually goes a little further than Jeff's sentiments (which I actually agree with, but for an entirely different reason than the one he gives). The majority of the beast assortment from the POTF2 days, Tauntauns and Wampa excepted, were pretty big shelfwarmers. Even the Dewback, which I still think is one of the best beasts they've done in the modern era, started to sit after a while. The Ronto was boring (and as an SE addition didn't have much appeal), the Jabba pretty much sucked (like the SE CG version), and the Wampa has since been surpassed by the 2004 Ultra Wampa. The Rancor and the Bantha were both great, IMO, but they were shelfwarmers of the ultimate degree (the Rancor more than the Bantha) and I would assume that the Bantha cost Hasbro a hell of a lot to sculpt, what with all the hair.
The Episode I beasts were on a continuum of "good but everywhere," "crappy but hard to locate," and "good but nonexistent." The Kaadu holds up well, sculpt-wise, even if it can't stand up, and the Opee Sea Killer, while severely underscaled, is very nicely sculpted and the action feature isn't bad at all. Jabba was pure garbage if you could find him, and the Eopie was something 99% of the US collectors never saw or obtained. The Faamba was heavily overpriced (Go Go FAO Chapter 11!) and even at the half price I paid for it (35 bucks), it still wasn't worth it.
The Reek was a shelfwarmer on the scale of the Ronto and POTF2 Jabba, and the Acklay was nice (it could have been better) but a lot of people never even saw it because of the Reek.
Anyway, my point is that with the vast majority of the ones I mentioned above, they just have not sold well enough in their initial releases to make me think that the market would go nuts over a straight reissue now. I think that the Eopie should be released in some way again, and the Acklay wouldn't be such a bad choice either. Everything else though would be retail suicide. Again, all just my opinion.
Personally, I'd rather see the Felucia worm thing with a Clone Rider, an Orray with Geonosian, and a Mustafar Flea with Rider right now more than I would care to see a redone Dewback. I'm definitely in the minority who would rather have more prequel figures than OT figures at this point, but all the OT beasts have been done fairly well at this point, and I'm all about new stuff as opposed to old stuff. Your mileage may vary.