Dividends are taxed at marginally increasing rates as with other income so those higher earners are still being taxed at 25%-40%, which is still quite high for something that is the subject of double taxation. 
Increasing the capital gains inclusion rate would be a horrible deterrent to investment in the Canadian economy and would more than counter any benefit from the stimulus spending the government is attempting.
Taxing the primary residence is not an answer either because that would harm the housing market as fewer people would be willing to sell and buy a new home since the tax would immediately eat into the money they would have after the sale to put towards a new home. 

How about the government just worries about their spending and stops trying to squeeze more money out of the tax payers?