How can we possibly know that it is safer? The damn thing doesn't even exist yet! Also we already have the infrastructure for air travel so there is no way it is cheaper.

Well, like commercial submarine it is one of the few forms of public transport yet to suffer a fatality :)

I am sure it will be safer than cars, and unlike a plane it cannot be redirected by hijackers. I'd be willing to bet a substantial amount at say, 2:1 that over the first 10 years of operation it will prove safer than planes in passenger deaths per trip taken.