I'd love to visit this incredible place before it's turned into an amusement park. I fear that any destination accessible by motorcoach will be consumed by tourists before long. Perhaps Bingham should have never told anyone about the city in the mountains.
There's already a train that runs straight to it and there is a luxury hotel there. You don't have to take the 4 day hike, it's just WAAAAY more enjoyable of an experience than taking a luxury train to a luxury hotel and plopping out of your luxury hotel room in your luxury boots to see one of the greatest man made structures. -Wusses.
There are plans for building a small airport there as well. I think we've been lucky to see this place as it was. Walking the Inca trail is a must! A week before I went up there I was at the Cementerio de Chauchilla, near Nasca: a 1000 year old burial site which was looted by grave robbers just the day before. They took one of the few remaining mummies (most have been robbed in the last decades). The site has been looted many times. Everywhere lie shards, ripped clothing and human bones. I was so outraged! The same is happening now in Greece and Italy. The Parthenon and Pompeï are falling apart due to lack of funds, corruption, pollution and vandalism. Go see them while you can, it may be the last time!