I would say the vast majority of people attending will have a compatible smartphone or be with someone who does (if kids tickets).
Unfortunately whether you like it/agree with it most clubs are now going digital. For me and a lot of other people its safer and more convenient.
There will always be a minority who cant use it and they will have to accommodate those with physical cards but i wouldn't say the club are acting 'stupidly' just moving with the times, like when it went from paper tickets to a plastic card...