http://www.radiotimes.com/news/2014-04-23/lost-reboot-is-likely-says-former-showrunner-carlton-cuse

"I think it's likely that at some point, ABC will want to reboot ‘Lost' because it's a valuable franchise,” the former "Lost" boss tells EW (http://insidetv.ew.com/2014/04/18/lost-finale-carlton-cuse/2/). Cuse, though, doesn’t expect to return if there is a reboot.
Read more at http://www.hitfix.com/tv-tattle#DS8fI30FmEJ84jlb.99

they aren't going to reboot Lost - it WAS a valuable franchise until they wussed out and pulled the "it was all a dream" BS and ruined the entire series with that horrible ending.