The BitCoin core deals with much more precision than what is currently allowed with the interface.
Unless a horrible problem is found with the BitCoin spec, I think it's a pretty safe bet that the value of BitCoins will rise gradually. While temporary bouts of inflation are likely (due to hoarding), BitCoin has a built-in limit to inflation, and this will hopefully prevent any serious disruptions.
I assume you mean prices.. They deflate when hoarding happens, as does the money supply.
And why would a deflationary currency be untrusted? Quite the opposite, i would trust it more than any inflationary alternative, regardless of the math behind the deflation rate, lol.