My girlfriend picked up the kew gardens 50p at work from the till, and she couldn't swap it because she had no 50ps in her pocket. Lost out ong a good £50 there. I always take a 50p to work with me now
The money velocity thing is very interesting. It's a big piece in the jigsaw of why inflation is so low despite all the currency creation.
All that we can definitely say is that it can't go to zero, so sooner or later it will rise.
I think Mike Maloney's latest video in Hidden Secrets of Money makes this point very well. At some point the money will come out of hiding abd be spent, and then the SHTF.