I think that what Janex is doing wrong is comparing RPGs to computer software... there is little to compare.
An older RPG is still viable. I can break out my 1st Edition AdnD books and still have the same fun I had 25 years ago. Same could be said about the 1st Edition Traveller rules (much better then any of the latter incarnations IMHO), the 1st Edition Paranoia Rules, 1st Edition Runequest... etc. Rule sets might go out of style, but they do not become obsolete in the same way computer software does.
The nitches might be smaller then the D20 / 3.x rulesets are, but the niches are still out there. I'll be interested in seeing OSRIC material that is released... probably won't see much use from me but I expect the products to be high quality... niches seem to bring out the best in creative thinking