Well it's pretty much a consensus that games aren't nearly as good as 2-3 years ago where anyone who had any respect for money would be a profitable player.
It's also clear that in 2007, poker was a rare opportunity, market-inneficiency if you will, that allowed some people earn vastly more than their skillset/intelligence would allow in other fields.
As more and more people study the game, the winnings will decrease until a point of relative equilibrium with other ventures. What this means is that you will be able to earn in poker the same as your opportunity-cost elsewhere.
So on average, if you have zero skills and can only hold a 5$/hr job flipping burgers, that's probably gonna be your winrate at poker, with no excess returns.
In fact, equilibrium might mean that profits are lower than opportunity cost because of the added enjoyment and time-flexibility of poker, so that more people might compete in poker than in other job markets turning it less profitable to compensate for it.
The only way for added returns to come back, is for either a law be passed to allow americans to play again with no hassle on depositing methods, or maybe tapping into the asian markets...
although in asia, people are much poorer per capta so not much money is gonna roll in.
But even if this occurs, its only a temporary "solution" cause eventually profits will dwindle again to this equilibrium
cliffnotes: sometimes, there IS a free lunch, but it's ephemeral.