Consider teaching a yoga franchise or teach an existing popular yoga style.

Advantages to teaching a franchised or existing yoga style:

Established yoga-style name recognition.
Good for establishing a teacher training school.
If you trained in the particular yoga style, you’ll be familiar with teaching it (less curriculum preparation time).
You can easily teach several styles – especially if they’re related (there’s lots of cross over.
Most styles don’t require you to pay franchise fees or royalties. This means you get immediate name recognition for no cost.
You’re not geographically restricted.
There’s an established community in that yoga style. If become proficient, you have opportunity to speak and demonstrate and be faculty at seminars, conferences, etc.
You’ll enjoy broad search engine demand (see below, both a blessing and a curse) – recognized search term (this is also a disadvantage because it could be very broad which makes it difficult for you to get premium search engine ranking.).

Disadvantages to teaching a franchised or existing yoga style:

It’s harder to distinguish yourself from others who teach the same style (not impossible if you incorporate your name or some other distinguishing method)
You’ll have book, DVD, product limitations. After all, if someone wants a book on Iyengar yoga, they’re going to by Iyengar’s “Light on Yoga”. That said, the name recognition might enable you to create a great book or DVD or other product with your spin to it.
You can’t franchise (i.e. be the franchiser) your studio (unless you distinguish it with your name or some other method).
There’s broad search engine demand = harder to get top search results because there’s more competition.