In 1971, average annual salary was about $8,000. In 2003, it was about $34,500, or 4x times more. So WSOP entry should be about $40,000. At this price, I think the field would be reduced to about 1,000 players.
More important, WSOP would REALLY deserve the name of "World Championship od Poker". Because that is no longer the case today.

Francois, Paris, France