I went from a 7 digit dialing plan on VoIP to requiring 10 on AT&T VoIP product and my wife and family got used to having to dial 10 digits. Went to VoIPo last year and am back to 7 with a few seconds wait to connect, and the wife doesn't complain.

I had more complaints when we had to dial 10 digits for 2+ years.

I would say that they will get used to it.