The fee is optional, so there is no way to control how high the fee is and miners may not find they get enough so they collectively stop (switch to mining other coins, like they do all day)
I re-state that it will be a trickle.
10k compared to the 500k now means it will be 2% of today's dilution of the existing coins. That is peanuts and the value will be higher accordingly - as long as Doge is still being used as much then as today, if not more.
The fee is not optional. Make a transaction with 0 TX fee in your wallet and you will find out. The network automatically charges fees and they were set about a month or so ago to prevent micro charges.