I have friends who left nikon to join canon due to better pixels and fair value prices by canon compare to nikon.
Better pixels:
[1] Not true across the board, arguably in some areas Nikon is better than Canon while in some areas Canon is better than Nikon.
[2] This will also no doubt change from camera generation to generation.
[3] If Canon in your segment offers better pixels then great, but also ask yourself if
you personally need the better quality.
Fair value prices
[1] Again, not true across the board. In some areas Nikon is better than Canon while in some areas Canon is better than Nikon. Take the new 70-200/2.8 zooms from each manufacturer for example.
[2] Again, this could possibly change from generation to generation, type of lens to type of lens. Of course the gap between generations is far higher.
[3] Were you planning on changing cameras/upgrading anyway? Otherwise any potential savings will be far negated by the cost in changing systems. If you're not planning on upgrading now, you might want to at least wait till you're planning a change/upgrade.
Arguably, perhaps a better tool to jump system for are push factors rather than pull factors (and with the factors you've mentioned, I think it's debatable as well). Ie for example if your current system doesn't give you something you need, or performs terribly in a certain area. Usually this change will be a result of a definite need, and more likely to be fulfilling.