It’s not so unusual…
for mtbers to have another bike for the really bad conditions. i have: a rigid singlespeed that gets pulled out if it’s too gloopy, cause it’s easier to clean and doesn’t go wrong. I only use my ‘good’ bike in winter if i’m going to somewhere like cwmcarn where i know the trails’ll be okay. lots of winter trainers are fixies too for pretty much the same reason, plus you get a really good workout riding one gear.
road bikes can be expensive and the salt on british roads in the winter can ruin them surprisingly quickly – salt’s the real killer. say you’ve got Dura-Ace and your drivetrain only lasts for two winters, you could buy a whole winter bike for the cost of replacing it…
your fulcrum 3s aren’t going to fall apart though, don’t worry!