I can't say, but maybe I should ask, if all the corn around me is Bt corn, but last I heard, no one in Nebraska had reported CCD and we certainly have a lot of corn. All my bees are in the middle of corn.
The other issue of Bt is that I've been spraying actual Bt (rather than the gene that they spliced into the corn that makes the toxin) for many years on combs for wax moths with no ill effects that I can see. So Bt toxin seems to be a doubtful cause of CCD. I'm not saying I think GMO is a wise thing to do, I don't. But I don't think it's the cause of CCD, at least not from the corn.
The neonics seem like a more likely issue. Again, I'm sure it's being used here as well as other places so that might weigh against that theory... but I can't remember the last time I saw dew here... we just don't get dew here often. It takes a particular set of circumstances that doesn't seem to happen often in the summer. So perhaps it's a combination of the neonics and the dew, or a combination of all of that plus other things...
A bee colony is a very complex thing and the world is even more complex...
I am having trouble with the whole "life expectancy" thing and the "30 years" thing. We weren't doing genetic engineering 30 years ago, and in the last 30 I don't see a significant change in life expectancy...
Now if you are comparing selective breeding with GMO and lumping them together, I think you're comparing boxing gloves with hand grenades.