PLEX in EVE is basically 30 days of game play time in an in-game tradeable form. So players could buy PLEX and sell it to other players for the in-game currency ISK.
This is similar to how players will be able to buy Tokens and and sell them for silver to other players.
If Token supply is low (due to even a fraction of those 7-8% of super token buyers quitting for whatever reason, or if p2p population is higher than what this poll has projected), if rich players decide to buy up and hoard tokens, if silver ever ends up inflating, all of those things will be bad for people wanting to obtain tokens and the situation converges on a situation where tokens become P2W (because F2P players won’t be able to get them reasonably).
Silver inflation is only one part of the equation (though it is an important part).
This analysis is also complicated by the fact that some fraction of those 1 token buying players will presumably want to switch to using in-game funds to buy tokens at some point. They will have a higher starting leverage point in terms of purchasing power because of additional dungeon runs. This will further make life not fun for F2P players.
EDIT: I would really love to be wrong, so criticism of my analyses are quite welcome!