In 1967, he self-published the groundbreaking book, Languages in Conflict: The Canadian Experience, in which he used statistics from the 1961 census to demonstrate a number of points which ran counter to the accepted wisdom of the day: Based on these considerations, Joy came to the following sombre conclusion: The forecast, therefore, emerges of a Canada in which the relative strengths of the two major language groups may remain similar to those found today but within which there will be a much more pronounced linguistic segregation: French within Quebec and English elsewhere.
Although Montreal may well retain its bilingual character, the English-speaking population of other parts of Quebec will probably decline in actual numbers, nor merely in relative strength.
If this forecast is accurate, then our politicians and editors should commence now to prepare the public for the inevitable by showing that the disappearance of linguistic minorities is a natural phenomenon, rather than the consequence of some "genocidal" plot.
Joy updated his findings periodically, based on the results of the most recent decennial census.
His third book, Canada's Official Languages: The Progress of Bilingualism, was published by the University of Toronto Press in 1992.