I found a good quote by Richard Aboulafia, an aviation analyst from the Teal Group about that topic on a blog post about UAVs:
Then there’s the oft-mooted civil UAV market. There’s something there too – homeland security and border patrol, to name just two roles, but nothing that will subtract from manned aircraft markets. Think robots will replace pilots on commercial and business transports? Pilots are a tiny part of the operating costs equation. Any savings from replacing them would be more than erased by higher insurance premiums, to say nothing of unmanned system costs.
The full post can be found
here.