I really doubt they would sell. Large scale kits have a certain fan base and they are a picky lot. Not only that, kits that are considered way more market friendly, I.e. 1/16 Dragsters and Funny Cars, do not sell that well according to Revell. I really doubt the vans would sell all that well at all.
I have most of them and I think they are really cool, but, then again, I was a kid when they first came out and they are a happy childhood memory for me. Would I buy them? Depends on which versions came out and I already have all the Revell 1/16 vans. I really doubt they would restore the MPC van back to its stock version given the last version was a 4x4. But then again, I could be wrong!
Also, there are way more old kits that are desireable for re-issue than those large scale vans.