Ok, so here's where my game's at now:
1. I've wiped out Caesar's camp.
2. I completed the NCR storyline up to the decision phase.
3. I completed the Yes Man (Independent Vegas) storyline up to the decision phase and executed it, which activated the Endgame and took me to Hoover Dam where the final battle between NCR and Legion is already happening.
4. I've upgraded the securitron army and routed power from Hoover Dam to them up at Fortification Hill. More carnage at the Legion camp, explosions are seen from Hoover Dam on the Hill.
5. I've gone back into the Hoover Dam offices and activated the NCR decision phase via Colonel Moore.
6. I've been taken to General Lee Oliver for a briefing.
7. He lists my accomplishments thus far, INCLUDING activating the Securitron army at Fortification Hill by remarking the explosions (part of the Independent Vegas/Yes Man storyline).
8. I get the chance to comment on my securitron army (presumably standing outside his office) in 4 different ways, all leading to the same line from Oliver:
"And... uh... well. These uh... these boys with you? Hello, there, smiley."
You can watch it here: http://www.youtube.com/watch?v=Y7sEJSvHahQ&hd=1
After that, you can hear securitrons arming their upgraded weaponry, but the game gets stuck there in cinematic mode, I'm stuck to the spot I'm standing on, the door behind me doesn't open, and Oliver just shuffles nervously in his seat.
So obviously the devs had thought of this permutation of events (accepting two endgame paths) and had scripted a somewhat humorous consequence for it. What I want to know is has anybody gotten further than I have without the game jamming stuck there?