I don’t believe it will change. If there’s a way to legit transfer $ -> silver, people will be doing it via tokens in the market. If we look at EVE as an example ( another game which allows its subscription to be sold on the market ), it still stayed at a reasonable price for someone to generate enough income to pay with in-game currency towards their subscription.
The way the economy is currently operating, it should be possible to farm items and sell them ( even at inflated rates ) to keep up with the inflation of token prices. Also of course, supply/demand will cause the price to change accordingly, as it becomes more worthwhile for people to buy/sell tokens, more will do it.
I’m assuming tokens will reach 1.5m - 2m. With low level items that you can farm to sell to higher level players, that amount still isn’t too hard to reach at lvl ~130. The downside is that you have to stop and actually concentrate on saving money.
Either way, I’m honestly in the boat of people who would prefer the game to be strictly subscription, and believe that most of the problems with the game come from the game being a mash of f2p/sub. I don’t really mind if people are forced to pay, but I also don’t think they are atm. Even if the price of tokens goes to 2m, it would take about 1-2 days of farming ( at lower levels ) to raise that amount of money.