I wonder if people at startups like ChartBeat, mix panel, clicky feel like the market is validated or feel worried. Or just keep focusing on doing a better job than competitors.
Real-time dashboards were one of the features people were willing to pay for. Now Google does that for free as well. There's not much I can do about it. I'm sure Chartbeat and such will still find customers, but I'm sure many that may have been convinced to buy will now settle for Google's free option instead.
I don't think MixPanel's worried about it. They're not solving the same problems as Google Analytics and GA will never be a substitute for that kind of service.
Visual Website Optimizer, Optimizely, and UnBounce all run paid A/B testing sites in spite of Google's presence in the market.
A counter example would be a service that provided a missing feature for a google product, that was later filled by google, but managed to survive after google launched the feature.