I see a lot of people saying there is no 10 year plan....Thats only kinda true. They have a set release schedule. They are contracted for 4 destiny games and 4 major installments like ttk. So one major release a year. At least 2 have been spent developing this game so far. We are in year 2. There are 3 more games, and 3 more expansions. 3+3+2+2=10
So yes they are contracted for 10 years worth of Destiny content if anyone would actually read into the contract <.< Bungie isnt exactly the most reliable source