Vaccinating a buck rabbit will only keep that specimen safe, it won’t have any impact on any of it’s offspring that isn’t how vaccines work. The good thing that the rabbit has going for it is it’s ability to reproduce very quickly so through natural selection it won’t take long (in evolutionary terms) until there are rabbits with a natural immunity until the next disease hits them.
Many pet rabbits are vaccinated against Myxi and RVHD I might guess that a lot that die of RVHD may just be put down to a natural death as pm’s aren’t cheap so I doubt people have many done.