I'm sympathetic to that argument. On the other hand, the Harper government did set up the TRC. I think it would be useful to at least consider some of their recommendations.
The TRC was supposed to be specifically about the abuse of native children in residential schools. It morphed into as wide-ranging a set of recommendations as you could possibly make, most having nothing to do with the actual subject of the commission. Immigrants pledging to abide by treaties would be one of those ridiculous stretches, and it's clearly designed as yet another dumb feel-good measure by a guy who wants every ethnic and religious minority to love him.