LOL, who said that mint is deflacionary ? 10 millions of mintcoins are generated by mint DAILY from now, and your assumption that no one mintcoin would be spent is plain wrong, all depends of the price to buy it, or the items that merchants offers.
I did some rough math and it works out at 10 million mintcoins generated a day by POS across the entire network. 10 million mintcoins is valued at 2 btc approximately right now.