Would I use one for the track? Yup. For the street? Why not? It's not like a crash on the street is going to be more forgiving because you're on the street.
As for it being hot in the summer, I ride in leathers in the summer. If I have an off the street isn't going to be any more forgiving when it's 75F vs. 105F. I'd use them in the summer too.
But...would you? Or better said, if you would, why aren't you doing so already if that's how you feel? Not challenging, just curious. One thing the Milgram experiment left pretty clear is that we can be pretty bad at judging what we'd actually do based on just our opinions. It's the same way plenty of people say "ATGATT's the way to go', and then pull up to your house not wearing a helmet because that day it was annoying. While I wear gear all the time (I'm sure you do, too), let's not pretend it isn't a compromise of comfort vs protection.
I ride in perforated
leathers with as little underneath as I can. And if it's real hot, mesh textile. Regarding the airbag, we're not talking about punctual occassions here, but regular riding. I really don't care for piling any more fabric layers on top. And if I have to constantly swap it from one jacket to another (as opposed to wearing it), forget about it. Probably the same if I have to conspicously wear it on top of my jacket, while having it restrict my access to jacket pockets or conflict with backpack use.
Perhaps the question should be refrained as what you guys think the future of airbags is in the consumer motorcycle market?
As opposed to how individual riders feel about it. After all, the set of riders that are committed enough to be spending spare time browsing around in a forum may not be the most representative demographic.
On the other hand, who knows, maybe it really is important enough to mainstream it. I don't doubt an airbag is less obtrusive then a helmet, and that's non-disputed standard gear now.