Why would you buy any goods if the value ouf your "currency" keeps going up? BTC is DOA because of its inherently deflationary properties. There will never be a consistently expanding BTC economy as hoarding makes more sense than actually spending it.
The people who like BTC for having a fixed cap on the amount of coins in existence are probably the same people who would like the gold standard back, because they don't understand the economic consequences.
Isn't Bitcoin's success as a currency orthogonal from the negative effects it might have on the economy? If individuals think holding Bitcoin is better for them than holding dollars, they will do it as long as it's legal.
As far as the economic effects, I think we'll be much better at managing a deflationary economy in 2030 than we were in 1930. We have more knowledge, better statistics, and better communication. At its core, the sticky wages problem is a communication problem.
In a world where Bitcoin has already been adopted by the masses, holding Bitcoin would make almost as little sense as holding dollars does today. Sure, its value will go up, but not as much as investing money in companies that make more money would.
The people who like BTC for having a fixed cap on the amount of coins in existence are probably the same people who would like the gold standard back, because they don't understand the economic consequences.