Rolex and Casio deal with simply when IERS introduces one. Beats is a new time measurement system, not just a new clock. So if the world (IERS) would stops it,

Rolex and Casio deal with simply when IERS introduces one. Beats is a new time measurement system, not just a new clock. So if the world (IERS) would stops it, they would have to have new rules for dealing with leap “micro-days” or “mili-beats”. And second is the fundamental SI constant, quite a bit of stuff is derived from it.