Gibby -
I think VW stopped production because they regarded the Corrado as a sales flop, which may explain why it has taken so long for them to come up with a replacement. With a very expensive price tag in its day, the total sales of around 97000 were not surprising. The shortage in sales has garuanteed it's rarity value though, and with an occasional mint Corrado Storm going for more than 10k, it's worth keeping an eye out for one.
I'm certainly holding on to mine.