The frustration of waiting for the bill is a familiar one - particularly when the babysitter's clock is ticking! 

However I am surprised that diners give payment methods this much thought in advance; aside from it just being a bit sad that anyone would look at payment before the menu (!) my experience is usually that I'm the 'payments geek' and it's a secondary consideration to everyone else.   Also see this article from Payment Eye which suggests that millenials are cautious about adopting new payment methods.

(Incidentally, if you're looking to split the bill, there's always Pingit or Paym!)