Welcome to the Forums Dracus :)
I suppose it is possible that they didnt like what they saw, however, i would counter propose that, short of EVE Online, which is space only, and SWG which only jumped into space after launch, nothing even remotely like STO has been done before.
In terms of MMOs, STO is boldy going where no MMO has gone before, and i think that fact in of itself is enough to scare alot of publishers.
Consider how much money a Publisher invests and puts into the publication of a product - millions if not more, tens of millions, hell i dont know.
I think that with such a "new" concept, 2 games in one effectivly, it would probably make the few publishers who are interested in STO, very, very cautious.
NCSoft dropped alot of MMOs from what ive heard, 3 or 4 others along with STO, so it wasnt isolated. Who knows.