I saw that Fat Guys Fishing is now making a mold similar enough to the Weedless Wally, but I haven't looked into them. There's enough interest in the head style, but not sure it would be enough for Do It to reproduce the mold, or new versions.
I bought a couple of single cavity molds last year off Ebay, based on the Lee/Lyman type of molds and they pour a similar head. I didn't know it was similar when I bought the molds, as the guy who sold them just called them a tapered head and of course photos on Ebay don't always show details well. The collars are made for tying or a band type of collar, but not really for plastics. I've added a wire keeper, but so far have not really tested them a lot. Here where I am, most jig folks are power anglers who use jigs with heavy wire hooks, but I could see this type of jig having use when finesse jigs are needed. It would have been a great little jig for some of the small streams that I used to fish in MD for LM & SM Bass.