There seems to be so much mixed information. How about just not doing anything radical (like going SS) until YOU spend some time riding in the winter. Frame corrodes(never seen it myself), buy another one, maybe with disc tabs. Gear don't work well then set up SS. Cable sticks then go full housing or lube more or with different types. Just start riding and solve the problems you have as they come up. Winter is a harder on bikes, but you are not crossing some great barrier where the laws of physics are different. Most of the time you could still pull out any old MTB and get to where you need to be.

Me, I never had any corrosion on my beat to heck mid 90's aluminum bike. Had a few cable stick issues, but nothing I couldn't work through. My drive train does take a beating in the winter but it's just parts and I like the different gears over going SS. I felt I needed discs for snowy downhills. Of course this is just what I found.