There is definitely movement on this front. To be honest, it isn't always the City or Province who is behind and unwilling to adopt new types of housing. For the most part, its the people who live in those areas. Here is an example of someone wanting to block the allowance of Garden Suites in...

Laneway Suites have access from the laneway, but Garden Suites will likely have access from the main house side yard. If you had your choice, which would you prefer to build?