Namco, Sega, Konami all have somewhat diversified interests and as such, aren't in danger of going under anytime soon.
Capcom though, well, umm. I really, really, really hope that Capcom can somehow continue to survive in the long term. A company with a legacy as rich as theirs should be able to leverage their assets and keep on living. I do however very much miss the old Capcom, the one that would regularly publish games they didn't make, would take chances on weird-ass games with no proven audience ("Hey guys, lets give Clock Tower 3 a massive budget, yeah? Sure, right after we approve these plans for God Hand"), and just made plain made shit that was fun.
Present day Capcom has slowly become just another risk averse pub that only makes big, unwieldy games. Ubi Soft (another publisher time bomb) without as much success. I still want them to pull through though.