Read your last sentence there again to yourself.

Correct, holding is using. I use it that way too. It's not an either/or, that's why I opened with "Don't sell most of your Bitcoin". The issue with this being the only way people use Bitcoin is that it this use is not seen by those who don't yet use Bitcoin. Because it's not seen, it's not mimicked, copied and spread. Because it's not copied, adoption doesn't go so fast if that's the only way that most Bitcoiners use Bitcoiners. By using a little bit (.1%, 1% whatever) in a way that interfaces with non-Bitcoiners, adoption spreads and the 99-99.9% of your remaining Bitcoin will be worth much more.