I enjoy visiting the province and city of Québec, especially Vieux-Québec, and speak enough French to get around just fine. It would probably become even more exotic for Anglophone visitors, but simultaneously perhaps more welcoming to tourists as they found they needed to depend more on their own attractions and initiative, and less on subsidies from the western provinces.
if Ouebec left Canada you would see the end of third world immigration into the province. The USA might have a chance to capture some, or all of the eastern provinces. Alberta might jouin the USA. Many interesting things could come from this.