[k_squared]

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My thesis:
Online poker games will get tougher as the growth of the online industry slows. Fewer pros will be profitable and will get "real jobs". As the growth rate stabilizes there will become an equilibrium of pros and new fish arriving daily to support them.

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Your thesis is flawed at least in part because it does not take into account the fact that fish become better players, which shifts the equilibrium, or in fact changes what the definition of a fish/pro is. Just because someone is a 'pro' does not mean they will never fall into the 'fish' category. When fish get better they will either start to beat some of the weaker pros or your equilibrium will be thrown off. It is not simply going to equalize, in fact the relationship of fish to pros will always be in flux. The only way to guarantee that you are a skark is to keep studying and adjusting to your opponents. Eventually if the pond does dry up (something I am not sure will ever happen in the near future) many 'winning' players who are only winning because the competition is so weak will now be the fish... That a 'point' of equilibrium exists is not a great hypothesis because the system is constantly changing in such a way that what is even a fish or pro can be redefined.