Last year I purchased a hybrid for commuting to work in wet winter weather. I did not realize how much I don't like the upright riding position, the thumb shifters and the huge gear spacing. Given my recent bout of apathy toward cold and/or wet weather, I have yet to ride to work in less than confirmed dry weather and I ride my road bike. Perhaps replacing the rear cassette can help tip the balance to make it rideable. OTOH, I bought a new carbon fiber road bike last April and I love it.

I think coming here and seeing all of the new bike stories contributes to the "must upgrade" feeling. I still like and ride my 2003 road bike. I did upgrade the wheels which were boat anchors. No more bike upgrade required.