Well....all in all, no I don´t think so. It´s up to Canon...
Look at it this way, consumers think Canon is a more prestige brand than the no-name Pentax and your friends think so too. So people will assume you are a better photographer if you buy a Canon. Canon has been selling well up to this point and many have expensive lenses, so Canon owns a lot of customers. Canon is also more likely to have a better market presence, i.e. shelf space, than Pentax.
Times may change though, but it won´t happen anytime soon. If Canon will be selling flimsy plastic bodies while Pentax will offer high quality bodies for similar prices, Canon will get hurt.
Canon is not competing as strongly as they could. I think they design the grip of the X00D badly so seasoned customers buy the X0D instead, which has better profit margins. So Canon has been competing as they owned the entire market, but now the competition is getting very heavy. D200 has e.g. been Nikon´s most successful dSLR and now Pentax take some share.
Sam