Even if bitcoin will deflate, bitcoins are still being added to the supply at a fast rate until about 2017 at least. So if you don't want to use a deflationary currency, just sell all your bitcoins in 2017 before deflation kicks into effect. It's not that difficult.

Deflation in bitcoin society starts when mining difficulty starts to be too high for profitable mining to average miner. It has already started!
Dollar-based economy is growing (between crisises) inflationarily, because people around a world DO mine gold-equvivalent in NEW goods, services, technologies, etc., in rate at least constant (but actually exponential). For this new THINGS, US goverment DO print new 'paper' dollars.
In bitcoin, mining difficulty DOES exponentially DEPRESS the profit for sell/buy NEW goods, services, technologies, etc., for BTC.
Just keep, accumulate bitcoins & play on BTC exchanges - it simply MORE profitable than ANY business that uses bitcoin as currency, including even mining itself.
Why don't you all guys understand it?