For example. I am an evil Bitcoin hoarder. Besides a few test cases (Amagi and local friends) I've simply sat on my Bitcoins for years. I believe they are extremely undervalued.
Yet... there have been multiple times where the exchange rate was simply going up too far, too fast (even for Bitcoin). I do not trust exchanges enough to play these extremely volatile periods, so in a sense I'm contributing to the volatility (by being an evil hoarder).
Now, when already established (meaning I can trust them) companies start accepting Bitcoins for goods and services, I can safely make purchases with Bitcoin (when I feel the exchange rate is going too far, too fast) which I would have normally made with fiat. During the following correction, I can repurchase those coins (locally) to replenish my evil hoard (after all, he who dies with the most bitcoins wins).
So... I will be patronizing merchants which accept Bitcoin. I will be reducing volatility by "selling" high and buying low. I will be getting goods and services at discounted prices.
Win, win, win.
Although, I will have to actually speculate that I'm correct about the exchange rate going too far, too fast. I guess I will be an evil speculator as well.
There is no bearish scenario for more merchants accepting Bitcoin. Sorry.
we need more "evil" speculators. the smart ones profit and reduce volatility while the dumb ones give us money!