The spin-offs gave us some great characters and memorable stories, so it doesn't all have to be about TOS. Going by what they've done to Kirk and Co now, I would shudder to think about how bad a TV series on the NuTrek characters could be.
If the PTB decided to go back to TOS, I would feel happier about a full reboot rather than just messing with timelines. Make more impactful changes and alterations to characters and universe as a whole.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)