The fact that Google hasn’t been near as successful at entering new markets doesn't seem to have entered the equation.
EDIT: and any web traffic analytics company you care to mention.
Google fails at a lot more than they succeed at. Chances are very good if Google enters a market they'll suck at it, and if you excel at it maybe they'll buy you if they want to own that market.
All you even have to do to beat them is provide any way for people to reach you for support.
But I think there's more to it than just that analytics is a particularly versatile industry, most of the stuff Google does could be retooled to solve x (or a variation of x) for a different y - and has: redtube, 5mins etc - let alone the also viable same y but better solution.
If it's not one of their handful of monolithic and to date unbeatable successes then their presence in a market really doesn't do anything more than validate it.