ATC passing you frequency changes whilst decelerating on the runway are not only a distraction to the pilots, but also "asking" to lose contact with the pilots. Best practice would be to ignore the call and then tx "say again" as vacating and the workload is lower, but we all try to help, and mumble an acknowledgement.
Usual result is when things under control Pilot 1 to 2 "what freq did he say", and not unusual to then select wrong freq so now not talking to Twr or Gnd
As BOAC says above, there is also little point in telling pilots at 1-2NM "please vacate at XX". The whole approach, flap and brake setting etc. has been determined well before, and I suspect if you were down the back, would not want to know you have 1 (or worse 2!) pilots at the critical landing stage trying to find exit XX in the plates
NoD