I agree Mike. I think it'll be a matter of time before new molds of M10, M36, M18 GMCs; M3 and M551 Light Tanks; M47, M46 and M3 mediums -- get issued. I even believe M5 and M9 halftracks will make it to market one day.
I know that companies like DML, Bronco and AFV Club are cutting dies for some pretty interesting subjects. I can't help but think that once some of the newer subjects get done, that those "classic" American WW2 and postwar AFVs will make it to market.
Like I said above, given my near glacial pace of model building these days, I can't complain too much about what is or isn't getting issued. I've got super nice kits on the shelf, just waiting for the knife and model cement and paint -- even if none of those wanted kits ever hits the hobbystores!