[Gwydion]

I believe that the ban only applied to Humans and not elves or dwarves. And yes the ban might one day be broken, but as proved in ROTK, the hobbits are a fierce folk when provoked and some hobbits,Tooks, would still go outside the borders, so they would not be totally isolated. The dunadain would most likely still travel to the Shire by leave of the king and the folk of Bree would probably still enter the Shire.

I also agree with Alatar that some hobbits would allow the Big Folk to pay them to transport their goods across the Shire and I say again the ban probably applied only to Humans because the Elves and Dwarves were not under the rule of Gondor or Arnor or any other kingdom of men no matter how high and mighty they may be.