The actual reason why bitcoin won't contribute to ~.
This opens up another topic, regarding the stability of the price. I'll skip that and assume the price stabilizes with -2% to 2% yearly changes (which is a sci-fi scenario, but anyway); will it bring economic growth? Remains to be seen. Shouldn't there be little
disincentive instead of little incentive?
BTW, the entire world using Bitcoin is, by far, the most sci-fi scenario, amongst all.
If
BTC becomes the only global currency and assuming the money supply stays the same (no private keys accidents, no second coming of Satoshi), it will be impossible to have an economical growth of decline without it also influencing the price by nearly the same margin. So the price will not go up or down in purchasing power unless something will happen in the economy as without this change there won't be any reason for the change price.
One more thing.
A lot of people think that money printing absolutely triggers inflation and that a limited currency will not. Everyone who thinks so should look at Japan, a country that is printing tons of money and is not managing to get inflation for more than a trimester even with a raging economical crisis.
inflation will not happen unless the prices of goods go up, if there is no demand and there is production, no matter how much you print these prices will not change, if people make a million a day but don't want to buy anything extra from condoms or cars there won't be any change in price. If the government hands everyone $100k but everyone who gets that money hides it under the mattress there won't be any change.