Well, one of the ways we measure it is by periodically polling. I can't cite you the precise poll, but there was a poll recently that showed that over half of Canadians thought their province should be officially bilingual.
The problem that emerges with those kinds of polls is that it's never really clear exactly what people mean. When they are asked in a polling question if they support Canada's language policy or official bilingualism, it's never quite clear exactly what people understand that to mean.
I think the polls are a useful indication, but they are not sufficient to really give an indication. I think there's much more positive support for Canada's language policy now than there has been in the past.