I'm old enough to remember writing IBM off in the early 90's and Microsoft off in the late 2000's. These companies had one thing in common: giant war chests of cash and legacy businesses that were still pumping out money by the truckload. It's not like a startup/small business that's riding on a razor's edge, these companies have so many resources they can keep searching for a way "out" of their predicament for a very long time until they finally land on the right combination of people, vision and timing.

We see it now with Google now being the "evil empire". They haven't had a real hit since Android and seem to be floundering, but online ad revenue is such a huge geyser of cash they're gonna be fine for a very, VERY long time.