I mean, if it comes to be March 1st and we still haven't heard anything I'll be much more worried and understanding of people canceling preorders. But so far it hasn't even been a day since this issue was first reported, so I'm willing to give Nintendo a bit of time to figure out their response. It's a bit of an overreaction to make a decision like canceling a pre-order before even hearing what the cause of this is and how it may be remedied.
At the end of the day, let people cancel their pre-orders prematurely if they want to (if they even actually had one), because that's just more stock for the rest of us who couldn't get a pre-order in.