My main concern with relegation is that we never get back to the Premiership. Look at Dunfermiline, Falkirk and Livingston as examples of this.
As a few have said, we would have our squad decimated in the summer and would have no leverage to attract better players as we would be in the diddy league.
Anyway I think even if we end up in the playoffs that we have enough about us to beat either Rangers, Hibs or QOS.