No, if it says printed, it should be done. You'll only end up stuck queuing on the phone with all the others, each complaining about the length of the queue!
True, but looking at the number of people who were worrying themselves earlier who are now posting things like "Just got my email!", I suspect it's nowhere near as bad as you fear.
I bet they're not all people with problems though. They're probably people who've thought "I can't be bothered to queue online, I know, I'll pop down to the shop and try and buy my ticket in person", despite the club asking everyone not to.
I suspect the "problems" are actually very few, and...