I kind of look at it like Swine Flu and Regular Flu.
Swine Flu has killed a few hundred people this year.
Influenza regularly kills hundreds of thousands of people per year just farting around the globe.
You're probably much more likely to die of the flu than to kill yourself after SRS. Well, that, and the point is that we're a high risk group for depression and suicide anyway. Who could have guessed that a demographic with our background would have difficulties beyond normal life issues?
I think a lot of people become entirely enveloped in transition, putting all their eggs in one basket, and after things are said and done, they realize... there's more to life. And maybe they didn't plan for that. It's a beginning, not the end.
If you're not chemically depressed, imbalanced, or suicidal pre-transition when you feel your worst, barring major life circumstances that can drive normal people to suicidal situations, you probably won't be suicidal afterward. If you are a high risk patient with a history relating to suicide, and you have SRS, betting the farm that it'll be a magical cure all, then as Eddie says, you might as well jump.
Talk to him about how important he and your family are to you and about how significant it would be to you to have his love and support through this, and how that alone will go so far towards eliminating regrets.