I don't see any point in sticking with Continental past 75k.
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Where this breaks down for many people is that once you acheive all the benefits that elite brings you at Continental, then you go off to another carrier and travel with zero status and zero benefits when you could be using the status and benefits that you already have on Continental.

While many of us have status on most carriers and the above doesn't apply, there are many that it does apply to.

Lastly, for me there is more to it than just accumulatiing status. I want comfort, convenience etc, and when Continental offers me a nonstop on most of my trips, it makes no sense to go and connect on another carrier just to build status. I spend enough time on a plane as it is