He is talking of mining and holding, hoping for the price to go up. That is a valid strategy, but if you are counting on the price going up, you can often make more if you _buy_ and hold instead of _mine_ and hold. With rising difficulty, many cards will not ever make as many bitcoins as you could have bought with equivalent funds at the time. This is particularly true is you time your buy well, like the $11 dip yesterday.
The price isn't guaranteed to go up again any time soon, IMO. Limiting supply doesn't help if there is no demand. The market would simply halt, if everyone just held their coins in hopes to get the price up.
In fact, in the medium term, I'm pretty sure there is a large amount of Bitcoins just waiting to be sold, which is likely to keep the price down for quite some time. This is actually good news to Bitcoin but bad news to those who thought it was a way to get rich quick with a bunch of Radeon cards.