The thing about migrating is that it is a positive act if you have good reason to move. For artistic people, I think that it can be very conducive to improved creativity (consider the US writers/artists living in Paris pre-war, soaking up the culture and experiences), but I have a suspicion that the fix has a relatively short high before elsewhere becomes the norm and the wanderlust takes hold anew. So you move on... and then, when you are old, you realize you don't really fit in anywhere anymore. Unfortunately, what you can never know is whether you would have felt quite as out-of-step had you never moved from the native hearth - we can never have the two experiences at the same time on which to base judgement of this.
Rob C