Here's the bottom line, you just buy for a dollar and sell for two.
That all there is to it, and will be.
Will bitcoin be the best and most efficient mean to accomlish that?
There just isn't enough manors for every bitcoin owner.
That's the core of the problem.
the idea is not to sell at all.
it may not be the most efficient way, but so was the USD. network effect of money etc..... you believed that when the price was rising right?
no, not enough manors for every bitcoin owner, (and that is not a problem at all) but remember this; there are 12 million millionaires in the world, and 1500 billionaires. there are only 21 million bitcoins, and I imagine most of those people dont have any.
Are familiar with market bubbles? Seeing any sign here?

we are all very familiar with bubbles. we have seen around 5 of them so far.