I'd prefer my entire audio collection on the same device, not because I want to listen to several months of music without interruption, but to be able to choose that particular album or track that perfectly fits my mood now.
Data abroad is dirt cheap compared to North America. $1.40 for 150mb when I lived in Vietnam. $30 for 3GB in Mexico. Much faster than Canada too.
I don't see any value for me in spotify, for example. In circles around me, spotify & co penetration is well below 50%, albeit most know about it.