Do you mean leave if they don't have an alternative?

I'm not religiously opposed to QR-code linked menus myself, but it just so happens that the last restaurant I ate at, the QR menu was broken and I was forced to ask for a paper menu anyway.

Now if a restaurant puts a lot of care and curation into a web based menu (and posibly ordering system!), and lovingly craft a complementary QR code to point to it, then why not?

A lot of the time the caring is the important part.