Being a member of the team I can tell you what they were thinking. The new head honcho doesn't like PC games and has even stated that in the past. Its pretty obvious he was responsible for the death of BIS. There was alot of bad feelings between BIS and the rest of the company since BIS actually produced titles on a regular basis instead of dicking around like everyone else. It was all politics.
So now they have bet the future of the company on 2 unproven projects. Fallout BOS2 (the first hasn't shipped and everyone knows its going to tank) and a console game based on the Exalted license. So instead of supporting the team working on Fallout 3 which has a proven record and was FAR along in development, they rest the future on the unknown.
You can be sure Interplay will sell the Fallout license to someone else. They've made short-sighted quick money decisions in the past (Hunter license is an example). They figure they can sell it off for a quick buck and save all the development money while losing any long term profit. Brilliant.
They will survive for awhile since Vivendi is stupid enough to keep giving them money. Also when BGDA2 ships that will give them a big stack of money so they will screw around all next year on these dead end titles until the money finally dries up and they go under. They might survive until the end of next year if they don't lose all of development. No one trusts them now so everyone still there is actively searching for jobs.