As much as I would like to see a long-running Trek series, seeing what the last few seasons of VOY and ENT brought us I'd be wary of them coming up with enough material and interesting characters.
I think they they realistically aimed for a five year run and ended it after that would be better, rather than dragging it out and ruining it. End on a high and leave viewers wanting more, its better than leaving them feeling used and violated.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)