Tina Beaudry-Mellor is the first entrant of the race, http://www.cbc.ca/news/canada/saskatchewan/tina-beaudry-mellor-leadership-bid-1.4247897
She's the current Social Services Minister and is a first term MLA. She's my MLA and I really doubt she'd hold onto her seat, even if she was leader. The NDP's polling lead is huge in Regina, and Eric Grenier will likely have her down at least 20-30 points below the NDP candidate come the next provincial election, not exactly the kind of position you would want from a leader.
If Grenier thinks she will lose by 20-30 then we will know for sure she will not lose by 20-30.
I like to think that we can do a better job of analysis then him.