What difference does it make?
It matters to certain economists and their followers. If you don't care, that's fine. Don't worry about it. I'm trying to remove doubts from other people that do care and do worry about it. They aren't impressed that you can buy pizza & drugs with BTC because they can do the same thing with USD and have the same issues with it, aside from inflation.
Better to tell those certain economists and their followers that their worries are misplaced. As you said, being able to buy pizza & drugs, or anything else for that matter, is not impressive. So why not just drop already the standard disclaimer, "once more merchants start accepting bitcoin, you'll actually be able to use them!" Its self-deprecating and ignores the true value and purpose of bitcoin.
Bitcoins obviously have uses. But, unlike gold or aluminum, those uses are dependent upon collective action. And currently, with such a small economy, that collective action must be global in scope. Or, at the very least, international. So there is risk in assuming that global, collective usage of Bitcoins will continue unabated.
Gold and aluminum are also dependent upon collective action. Both depend on the existence of a collective market of buyers to be useful investments, just like bitcoin.
Yes, the bitcoin economy is small. Its still a very thin market with much risk and volatility. That's a good thing, as there's as much risk to the upside (reward) as the down.
The important thing is to focus on how fast the bitcoin economy is growing. This growth is demonstrated by the record volumes and prices at which they are traded. The argument that a lack of merchants accepting bitcoin is a sign of weakness of the economy completely misses the point. Bitcoin is a value storage system, not a value spending system!
Spending bitcoins directly is a waste of their potential (potential to increase in value), so merchants are already at a distinct disadvantage by requesting bitcoin. Don't get me wrong, new merchants accepting bitcoin are a good thing. However, a lack of such merchants is not a sign of weakness, but we would expect of a precious and convertible currency. The ability to sell them is their primary indicator of health, so that's what should be in focus.