The Red Ensign seems to be a military flag in Canadian history. I don't think a campaign to restore it will go far over now, more than 60 years later. People know the flag with the maple leaf in its centre. Few will know (or remember) the old flags, including the Red Ensign. Also, it seems to be about Canada's heritage with the British and the monarchy in England. I think we have outgrown that. It is symbolic, not purposeful or necessary. I don't want to forget our past, our links to England, and France. But, I'm Canadian, the maple leaf is Canadian. I don't want to trade it in for another flag. But, I do still like the name: The Dominion of Canada. It sounds formal and elegant but its about being under British sovereignty, so a cosmetic title and not used any longer.

Dominion Society of Canada - Restore the Red Ensign

In 1965, the national flag of Canada was changed from the Canadian Red Ensign to the current Maple Leaf flag without so much as a referendum to give people a voice to see if they wanted to change the current flag or not.

In 2014, while it might be too late to make the Canadian Red Ensign the national flag of Canada, it is never too late to right this historical wrong by making the Canadian Red Ensign an official flag of Canada similar in status to the current national flag and the Royal Union Flag.

The Canadian Red Ensign should be flown at all appropriate war memorials and cemeteries, Canada Day, and other places and events where Canada's past should be honoured. The flag should be also be accorded the same reverence and respect as the national flag.

via - Bring Back the Red Ensign. (Facebook group, not active)

I also found - Canadian Red Ensign Campaign The website is 404 but the page is still on Facebook, not active.