Let’s not have an ideological argument here, shall we? As fun as those are in Planescape :Torment, the fun quickly evaporates when we’re in an internet forum setting.
Regarding licensed products — my two cents here is that they’re much better off doing something original. That way, if they actually make something of Planescape quality again (doubtful considering budget, but it’s not impossible), they can actually make a sequel—which is what people wanted with Planescape, right—create lasting changes in the world, etc. The cost of licenses is also higher than most people expect, I’d surmise, unless you have a very good pitch. Obsidian have been making mostly licensed games, so they presumably know how to pitch their licensing, but I still think it’s much better for them in the long run if they could make an original IP of their own. (I really don’t want a repeat of KOTOR2’s Development Hell…)
As far as ‘original ideas cost money too’ is concerned : Obsidian has a couple of original projects they had to cancel due to lack of funding. I’m sure the design assets of some of these could be cannibalized, and I’m sure they have ready ideas for games they can’t make because they’d never get greenlighted.