What do you mean by 'moving away?' - in the UK, 50 miles away, 200, 500?
I left home aged 19, when there was no computers, no cheap flights, and phone calls abroad cost a bomb. Initially for 6 months, which turned out to be 40. I so admire my parents who never complained and never made me feel guilty, ever. I visited once a year with the children, and they always came for Christmas as DH couldn't have time off, and in the Summer.
When we decided to move abroad, we discussed this a lot with ACs and they all said 'go for it' and we will all have a wonderful home from home in a place we love. No further than if we lived, say, in Devon, and they in Scotland. Cheap flights now, Whats'Up, etc, and we drive over a couple of times a year and they visit here too, and we also meet for joint holidays abroad. Many friends who have ACs and DCs in the UK, say we see our ACs and DCs more often than they do.