So here's where I stand on this.... I have 2 of the Walthers ones; one that is still 5V, and another that has PS3 by virtue of a frame swap. I also have the Walthers prototype paint sample shell. I'm still gonna buy the new version, maybe all the numbers depending on what other versions they do (I still need a pair of silver roof Phase IVs)... because the 10 or so P40s and 42s that I have just doesnt seem adequate
If they don't repeat numbers I dont think the value of the old ones will drop.... they seem to churn regularly on ebay, but not that frequently. Take a look at the prices of any of the older Genesis releases... PS1 version excluded, they seem to hold up pretty well. The fade stripe models of the same vintage as the Walthers model go for $300ish as well. And they say there's no demand for Amtrak. They may not continue to go for $650 a piece, but I doubt they're going to plummet.
If they wanted to "preserve" the original Walthers models, then they could have done the original version of Phase V with the blue frame stripe. I doubt they'll do that though, its much easier to just re-shoot the model they've already got. Perhaps this time they'll get the color right.