In 1980, roller-skating was really cool.
So it was a good time to release a skate-themed song...
But a rock band like Dire Straits releasing a song at the tail end of the disco era about something that was tied into the disco theme.....THAT was an achievement. Sure, it was light rock, with pop overtones - and ended up being a minor radio and major MTV hit - but still. Achievement.
And yes, that's a steel guitar in this rock/disco song. So, even more fusion.