I think the UFC made an understandable mistake with their lightweight division.
They had a ton of talented fighters at that 155 weight. Thomas. Serra. Penn. Franca. Edwards. Sudo. Uno. Pulver.
But when they fought each other, their skills were often neutralized, and they took fewer risks (with good reason). As a result, some (but not all) of the high profile LW fights were dull for the casual fan.
UFC could bring this division back to the forefront by adding an extra LW fight or two to the undercard (making 9 or 10 fights) that would feature one of the above stars against a real up and comer. Odds are the star would win, and win quickly, and slowly build a highlight reel for the division.
That way, you slowly bring the division back and generate interest, showing what these faster fighters can do.