I wouldn't immigrate to another continent for Aikido even if I could (actually I suppose technically I could, though I like where I'm training so it's a moot point). It's important to me, and a big thing in my life, but not the only important thing or even the most important thing. By that standard I'm a dilettante, and personally I have no problem at all with that
I'm not even sure I care or am even all that curious about how 'committed' other people are I'm training with or discussing with, or what it has to do with me or with anything. If I can learn from training with them, or if they have a good point in a conversation, that's really all I care about.