I think that the brief submitted by the Fédération des communautés francophones et acadienne du Canada mentions the need to have an active offer of services in French. Since people are used to being served in English, they won't automatically ask to be served in French.
I think signage should also be in French. I don't know if it will be like that outside Quebec, but in Quebec, French will predominate.
What other means could be used to determine which businesses will be subject to the Use of French in Federally Regulated Private Businesses Act and to encourage people to ask to be served in French?