My understanding with the way the ending played out was that it was being set up for a possible sequel Spoiler The car that Ronan gives Blue for example, I'd be willing to bet is the one that ends up in the past since it doesn't need gas. I'm really hoping their road trip gets revisited at some point. And if Glendower was always dead then who was the last sleeper? In the end there were a lot of questions, but otoh I kind of like that there are still mysteries for them to solve. Maybe some of this will be revisited in the dreamer trilogy.