Theoben going bust was nothing to do with the rifles, an article at the time reported (allegedly) iffy dealings linking their collapse with the setting up of RAW USA.
.20 struggles in the market place because you can't walk in to a dealer & buy oneput rifles on the shelf at the same price as the other cal's & they will sell.
It's exactly the same argument I had with BSA's marketing director about .25cal back in 2010.