From someone who does work in the retail industry, should pennies eventually be removed from primary circulation, I expect that businesses will change their prices so that "Ticket Price"+GST&PST (on a per-province basis) would always come out to the nearest $0.05, but then there are those who are exempt from paying PST, which will result in the afore-mentioned non-$0.05 final price. Rounding is fine, but as one who deals with consumers, if the price gets rounded down in their favor, they're all for it, but if the price is rounded up, they'll scream bloody murder and demand to speak with the head of the company, even if the law supports such rounding.
For better or worse, the removal of the penny from the mint lineup is the first step towards an economy without hard currency.