Honestly, given how cheaply the Hetzer is generally acknowledged to be built in the fiction (dubious leftover parts after assembly and all), even if Quikscell went out of business tomorrow I'm positive there'd still be other firms churning out unlicensed knockoffs and original just-about-copies (how hard can "put armored box on wheels, stick big gun out front" get for anyone already manufacturing military vehicles, anyway?) that would work out to basically identical vehicles for tabletop purposes.
Until the BT battlefield itself changes thoroughly enough to make the concept of tanks (and probably 'Mechs) itself obsolete, I'm not too worried about the basic design's future.