Big issue is the cost to get a full network up and running. Need a huge footprint for small populations in Canada, not an easy investment to make in a penetrated market.
Small Wind/Mobilicity type of networks have not been successful even with cheap prices.
Can't remember which article it was but it was estimated that it would cost $2b to build out a full network that is equivalent to Bell/Telus/Rogers in Canada.
Companies like Verizon have 99 million subscribers in the U.S. The entire population in Canada is 34 million and Verizon would have to build a similar size network to that of the U.S. in order to service them all.
I don't see the appetite for new entrants now in this market place, it is already too much penetration in Canadian market. 5-10 years ago before the Canadian Mobility sector took off is when the Canadian government needed to be pursuing more foreign investment.
Koodo launched their changes today:
http://koodomobile.com/en/ab/index.shtml