There are far too many good licences sitting out there doing nothing. Decipher has the rights to Star Trek and LotR rpg's and they're just sitting there rotting (except for the Original show which Steve Jackson Games is using). Last Unicorn Games had Dune but when WotC bought up those rights they just killed it.
Is it really useful, or even financially sensible, for these companies to hold onto rights that they have no intention of using?
Decipher does not have LotR's or Star Trek and hasn't since around their embezzlement problem. Cubicle 7 has the LotRs license now and the new One Ring RPG is being made as we speak. Also that is not the Original Series that Gurps is using it is the Star Fleet Universe (Prime Directive) which is a parallel universe and completely different license than normal Star Trek canon.