Rapala says that the "origiinal" Wiggle Warts it is now selling are made using the old Storm molds. The difference in action, if there is any, is supposed to be due to the use of a different plastic--or so I read somewhere. Having toured the Rapala plant and after meeting some of the engineers, I'd guess that the original series now made by Rapala also doesn't leak, uses sonic welding or comparable other system to glue parts together and in general isn't as erratic in manufacturing process as was the case before the purchase.
As for the possibility of obtaining old molds and selling enough to make it worthwhile, I dunno. Currently, the competition is Rapala with its two series, Brad's Baits, Yakima Bait's FatFish, and the Luck-E-Strike version. Then, if you add in the new wart-action baits, such as the Koppers' HFC craw, I'd say the competition is pretty stiff.