OK I'll strike the idea of shorts but the main point is no one has an ice axe or crampons. I'm hoping the main trail will be open
by our trip date, July 4th. and the link forecast says it should be, I'm hoping !
the switchbacks never technically close or open, it's a matter of which route makes the most sense due to conditions. the slope up to Trail Crest is very steep, hence the switchbacks. the cable section will be covered in a thick layer of very slick bumpy ice for several weeks.
ice will be there on your trip. in trail runners it can be incredibly tricky or dangerous to cross. boots with Vibram soles add a bit more traction, but it truly depends on your skill and courage to try. some will try, some will turn-around and some will bring winter gear for those challenging sections. there are areas that you do NOT want to fall. when you encounter the ice, your group will need to make a decision.
regarding Marmots at Trail Camp, my advice is to keep all food and scented items out of your tent and in your bear canister and place that away from your tent. then zip-up your tent closed. leaving it open invites Marmots to come in and relieve themselves. it happens, i've seen it! and it is not fun to pack up a soiled tent after summiting. i have done countless backpack trips into Marmot country and i have never had a Marmot eat through my tent since i leave nothing in there that smells interesting.