Not if you don't like good bokeh.
It may surprise you to learn that most people don't give a Flying Eff about bokeh.
Actually.. Most people do care about DOF and Bokeh, they just do not fully understand why a photograph attracts their eye. They do not know how to assess the effects nor how achieved it on a consistent basis. You can see it anywhere, go look on Pbase, DPReview, Flicker etc.. they are the pictures that get commented on the most, get put in the photographers favorites folder, have the most impact on the viewer - and for 'most people' those shots were just luck because they do not really understand what they did.
The problem with shooting for that effect all the time is a rather thin DOF (missed focus) - consumer grade lenses that do not have the sharpness at faster apertures (the proverbial 'soft lens') nor better aperture mechanisms that produce the more appealing bokeh. I have read many comments from 'most people' who question why others would pay $1200 for a 50mm f/1.2 L when 'their' 18-55mm kit lens produces sharper images (at f/5.6 of course).
If I had to guess I would say Canon has decided that f/2.8 is a decent compromise for many. Still providing a creative tool for those who know how to use it, yet still providing a better opportunity for most people to get properly focused shots across the majority of their camera models.