As pulse dialling is now recognised by stored program control software, rather than by electro-mechanical exchanges, it's usually possible to differentiate between a faulty line (where there appears to be a continuous string of '1's) and a '111' call (where there are only three separate '1's, dialled within a given period of time). So I doubt that there will be a technical problem with the introduction of the '111' number.
However I can't see that anyone could have reason to complain if pulse dialling was made redundant. Strowger died 108 years ago. DTMF has been around for about a third of a century. Surely it's time to move on?
Chris