Hubs are all very big cities. very big cities are growing faster than small ones in general. Big cities not quite big /lucky enough to be a hub are getting point to point routes that are farther away than just hubs. Small cities still have flights only to hubs.
Of course this depends on the destination. Even tiny airports often have point to point trips to Las Vegas on dirt cheap airlines because that is a popular destination.
Of course this depends on the destination. Even tiny airports often have point to point trips to Las Vegas on dirt cheap airlines because that is a popular destination.