Why would you continue making things that don't sell?

Then you have a business that goes under, and more unemployed people...then they don't make anything anybody wants. Then the people that work for Great Planes, Horizon, etc, that do enjoy the hobby no longer have a job to support it, or their family.

There are more choices for glow powered ARFs now than there were 15 years ago...what's the problem?

As electric options get bigger, your glow options get bigger, too. In case you haven't noticed, E-flite has a metric crap ton of .15 size models that could be converted for glow (oh no, there's work involved? Darn!), so you, too, can get away with flying at a smaller field. OS does still make .10, .15 and up glow engines. An OS FS30 in a .25 size E-flite SuperCub would be awesome! Or what about an E-flite .15 size Pitts Model 12 with a .25AX?

The only options getting smaller for glow powered aircraft now is peoples' willingness to convert or ability to come up with something with thinking that goes outside the box.