I have no idea how well they would work for the evil called capavitive buttons. I am consistently fighting with every electronic item I own that has those damnable things. I guess my fingertips just don't hold a charge.
Probably not a good idea...
The more likely time is when stopping for a minute to look at the map or change playlists. It is obnoxious to always be taking the gloves off for it.
I don't like to talk on the phone when I'm not riding; why would I ever choose to do it during my decompression time? :)
Also, a lot of touch screen phones (iPhone in particular) have been adapted for modern use. With my Klipsch Image S4i headphones (or with the natural iPhone 4 headphones), you can answer/hang up calls using the headphone controls. I've yet to figure out whether I can activate voice control for dialing, but that'd be even better.
When I need to dial on my iPhone in the winter, thin cabretta leather (damascus d302 for example) works wonders, at the same time keeping your hands dexterous and warm. I feel a lot of the problems you're describing are more functions of outdated technology, than poor design in general.
Or put to break this question into two parts:
1. Who would like to answer their phone when it rings, whatever the weather?
2. Could the phone sometimes be the "other" way up when you take it out of your pocket?
1. You already can, by using headphone controls. 2. Sure (if you don't feel it out), but how does a buttoned phone eliminate this problem? The issue is not mutually exclusive to touch-screen phones, and I'd argue it's worse on buttoned phones, since you risk the water seeping in between the button cracks.
Someone who lives in Seattle?
Long hold on the headphone button.
People who have never managed to figure out whether it's a single click, long click, double-click, or whatever else on the headphone button to answer the phone.
People who have never figured the above out because they have a couple different sets of headphones that have made different choices from the above options.
People who don't habitually wander around with headphones on.
People who have already taken it out of their pocket to see who's calling.
I also make use of a pair of headphones with a control dongle to answer/reject/end calls and/or increase volume.
http://image.made-in-china.com/2f0j00nTEtNeUzVaqh/Fish-Sausa...