You should do whatever feels right for
you. Truth be told, I think many people who buy dSLRs end up by using only 1 lens the majority of the time anyway. It's only the enthusiast (majority of the forum members probably!
) who goes crazy buying multiple lenses in varying focal lengths.
You won't burn a bridge (pun intended) if you sell your dSLR...if you find you have the itch further down the line, you'll save up and buy new equipment. And probably sensors will be better, etc., anyway.
I gave up my semi-pro shooting and went for a good point and shoot for years before recently deciding to go the dSLR route.
Just keep us posted on when you put the stuff up for sale!