It's a much more nuanced question if you don't hold USD in the first place. Here I have a choice between holding BTC and holding CAD. Both fluctuate compared to the prices of stuff I want to buy from US retailers.
And if you're already thinking like that, Bitcoin isn't nearly as scary.
That's the past year. The flat blue line around 0% is CAD vs USD. The crazy red line that's all over the place, swinging by as much as 100% in a matter of weeks, is CAD/BTC.