Years ago, during the 50's and 60's, Japanese restaurants were pretty rare. In Vancouver for Japanese food one would've to head down to Japanese Town. In the early 1970's North America was introduced to the Japanese steak houses which started to appear in the city's downtown.
Slowly sushi restaurants appeared on the scene. To meet the needs of the increasing Japanese tourists, perhaps?
Sushi restaurants really took off when we became aware of and associated it with healthy eating. I don't know about other cities but in Vancouver there seems to be one on every block.
This particular sushi bar is inside the Superstore supermarket. Is it a sign of reaching the saturation point?