I don't like the idea of reboots, but my main problem is the idea of throwing money into an already existing idea when they can try and make something new.
Let's say the Luther reboot is cool, fine. But why have 2 versions of the same show (especially if both are in English, I get if it's an adaptation of a Belgian show...) when you could possibly have 2 completely separate and good shows.
I equate it (a little) to the CSI spinoffs. Why do the same show in different settings and say, "Hey, Neil Cross, Luther was great, what else you got?" instead of "Hey, Neil Cross, Luther was great, wanna do it again with Blair Underwwod this time?"