Is UberRush going to change the world, or ultimately make it more depressing?

[youtube http://www.youtube.com/watch?v=uUrlX_lEKLQ&w=600&h=315]

Uber -- which may have been on a path towards world domination anyway -- just launched this thing called UberRush (trial version is in Manhattan), which essentially works like this:

You want to send your air mattress to your friend downtown. You request a delivery person on your Uber app. He…