They won't be going anywhere while the Queen is still alive but they're even less likely to go anywhere when she's dead! Harry will be the son of the king then and will probably have to take on more responsibilities.
True, but I think Meghan has her eyes on the Commonwealth. That certainly came across in the engagement interview. They could fulfil a lot of Commonwealth visits and duties from a permanent home in, say, Canada. They could easily travel back to the UK for those royal duties that require their presence.