True if you wait like 3-6 months when the hype goes down and stock is available you can get better rates as the demand lessens, but right now and for the next 3 or so months it'll be too high of a demand for the product to get them to come down on the monthly fee when your getting them to carry the extra cost of the phone, this all goes away when you buy the phone straight out.
With Rogers I cancelled even after retention talked to me just cancelled and was going to switch, they give you 30 days before closing your line but before that 30 days is up they have someone even better than retention who calls you to keep you, that's when they offered me 50% off for a year of the $65 monthly plan so my bill was only $32.50 a month for unlimited canada wide talk text with pic/video, caller ID, voice mail and 2 GB of data, this is the power you get when you don't need them to carry the cost of the phone, they don't want to lose your business and since you're not in any contract or have to buy out the phone remaining balance you're able to get much better deals. You can also try out wind mobile which has towers in Calgary and you get unlimited talk, text and data(5gb) for $35 a month no contract.