You really think they are not going to import the security hassles at the airport totrains? Of course, they will and then the train will be hell too.
Las Vegas is a huge tourist attraction especially for people who live near the city much like Disney and the Cruise Lines are to Floridians, if you make it easier and fun for people to travel then you have a chance to be successful
They are probably are already looking at the number of people who travel from LA to Las Vegas and have calculated what percentage of them they need to convince in order to be successful, they are not trying to invent a new market but participate in an existing market