One of the problems with Vegas and LAS is that the taxi and limo industry is not going to be able to handle the volume of people arriving at LAS in ten years time. That is why the city is building the monorail. It isn't great, but it's better than 2 hour waits for a taxi.
I just wish they'd run a train from L.A.-even if it took five hours, that'd be more predictable and easier than driving is now.