I fail to see how there would be too little interest in these to justify running them. I'm sorry- even if you showed me the research and the hard data, I'd still have a hard time seeing it. I don't know if they'd break any sales records, but I'm convinced they wouldn't exactly "tank" if they hit the marketplace. Yes, from what I've heard the reissued engine parts packs did exactly that, but a standalone car engine and a complete motorcycle kit isn't quite an apples-to-apples sort of comparison. And regarding that... here in 2014, Round 2 seems to be doing pretty well with their parts pack reissues, and even Moebius has gotten their feet wet in that department. Maybe in 1997 these bikes would have been a dud, but I'd say they stand a much better chance today than they did then.
Seems like the kit manufacturers are pushing the reissued plastic as fast as they can bring 'em out these days. Even examples which were just reissued a few years previous. Maybe now is the right time for these to come back. All I can say is annoy the living carp out of the online vendors, the local hobby shops, and of course, Revell themselves. Make some noise. If the tooling is still viable, and Revell sees enough demand, what's stopping them from bringing them back?