I hate to say it but at this point, considering how "Today is Life" ended, I'd rather the show go into retirement on a happy note, with Mac being happy again as opposed to descending into banality like Miami did.
I see only a 5-10% chance at best of CSI:NY being renewed. It's cheated death three times but I don't see a 4th cheating of death. But either way, it's had a great run. There comes a point when one gets tired of "Will it be renewed or cancelled/ended?" for so long every year and for me, considering how Today is Life was, I'd rather it go out on a dignified and happy note, than lumber on into mediocrity.
If it gets renewed (Which I don't see happening), awesome. If not, it's had a good run and may it Rest in Peace.