This looks like it could be really cool. Would like to see this go one step further and bring in VR so you don't have to look at your phone, but this is a good start.
Pros:

• Learn how to dance without needing to take lessons
• helps those who are shy
• much cheaper than dance classes

Cons:

• Probably not as good as the real thing
• Have to look at your phone, might get annoying.

Overall, I like this idea. I can see it being the starting point for more elaborate programs in the future