Final answer:
The statement is true. The type of theatre scene once found almost exclusively in New York City, known as Broadway/off-Broadway/off-off-Broadway, has indeed become firmly established in numerous leading cities throughout the country.
Step-by-step explanation:
The statement is true. The type of theatre scene once found almost exclusively in New York City, known as Broadway/off-Broadway/off-off-Broadway, has indeed become firmly established in numerous leading cities throughout the country. This model of theatre, characterized by commercial productions and varying sizes of venues, has gained popularity and prominence in cities such as London's West End. It is important to note that while New York City still remains a hub for commercial theatre, similar theatre scenes have emerged in other cities as well.