As others in this thread, there would be massive divides with no resolution: the Prairie provinces would want one thing (Alberta might want something different from the other two as well), BC would want another, Ontario another, Quebec a 4th option, and the Maritimes would want a 5th. Logically I can see some basis for agreement among the smaller population regions, but I don't think the way the country is divided regionally that they would ever find something to bridge that gap.
Quite so, Wulfie. Dumpthemonarchy has posted a poll showing that a majority of Quebecois support getting rid of monarchy. I suppose it is reasonable to expect that French Quebec wants to get rid of British monarchy. However, Quebec will have its own alternative as to what it should be replaced with, and very likely will throw a tantrum if it doesn’t get its way. Talk of independence or autonomy will become widespread.
There is really no reason, no incentive for provinces to agree on an alternative, it is just not a burning issue. If Canadians really are in favor of getting rid of monarchy, then the first task before anti-monarchists is to raise the profile of the issue, make it into a burning issue. Unless that is accomplished, nothing will get done.