I wouldn't hold my breath while waiting, unfortunately. TMG is built on top of FoxPro, which was discontinued by Microsoft in 2007. FoxPro is '90s technology, which severely limits TMG's forward momentum. The only way forward for TMG at this point would be a complete rewrite using modern tools. Bob is unable to do it; I don't see the financial viability in anyone else committing resources to it, either.
TMG will continue to work, at least until the next version of Windows breaks it. After that, who knows?