Have lived in the area all my life and would never move, so guess I am bias.
The reason DP and I have never moved is because we love the slow way of life and being in a rural environment. Sea and moors within 15 minutes' drive. More than 48 hours in a big city and we miss the westcountry. The employment and housing situation here is all we and our families have ever known, so not a problem. Doesnt bother us that supermarkets are a fair drive away, rarely open 24 hours, public transport isnt great, cockerels often wake you up, tractors often make you late for work and culture is, ehm, quite 'rural' (with a few exceptions). On the down side, the area isnt ethnically diverse and this can result in prejudice (especially within my parents' generation) but more recently things seem to have improved.
When newcomers arrive, they usually fall into two distinct groups. The first lot are those who think it will be bliss, but quickly miss the diversity and speed of life of more urban areas. Two colleagues who came here for uni and stayed to start careers here have recently returned to their home cities as they were basically getting bored of what initially attracted them here.
On the other hand, there are also those who embrace the slower pace and quickly play an active part in all aspects of the community. It's thanks to these people that some communities have survived. These tend to be the people who stay long term and are very much welcomed (unlike some second home owners who sometimes contribute little to the community and can therefore alienate themselves - in one particularly picturesque town a significant proportion of the homes are left empty for over half the year which upsets locals who say they have been priced out of the area; I suspect that this might make some locals initially sceptical of newcomers).
My partner's cousin recently came down to visit and 'test' the lifestyle with a view to moving her family from London. They quickly decided they loved it, but it wasnt for them long term; instead they opted to move to Bath which they felt was a good compromise.