A few years ago, while I was in Japan visiting, they ran out of SUICA cards and visitors arriving couldn't get them. Left a lot of folks in a real bind. Fortunately I had already had cards for my family- and when we left we returned them for the deposit so they could be re-used, but they had a shortage for a few years! They should have used standard NFC, but being an early adopter has its downsides I guess.