The hope would be that, as adoption increases, real-world use cases would become more prevalent on Lightning.  Retailers providing tangible goods and services would ideally start to see as much traffic as exchanges.  But obviously we'll have to wait and see how that pans out.

I'd say it's not that uncommon for most of our daily financial transactions to be with businesses rather than other individuals, so it's only natural that most of the money will flow in a similar fashion in Bitcoin as it becomes more mainstream.