People want TF2 to evolve as an esport but don't want new changes. You never know this might just be the thing that launches us into the esport mainstream, but if you don't sign you will never know. It's up to us to show Valve the potential in TF2 and stop waiting for them to notice. This has been said before by better spoken people than me but its still true.
To summarize:
Why not give it a shot and sign?