Well, take a look at the story so far. We've killed two of the hive gods (or will have), a Fallen general and a key vex construct, thwarting an attempt to take over the solar system. From what I understand the planned release structure for destiny is a new game every two years, with each game getting four DLCs like TDB and HoW, and one expansion like TTK. The next two DLCs are already confirmed to be vex and cabal, and I expect them to do the same for each game. As TTK mostly focuses on the hive, I expect the final 3 expansions will focus on each of the other races in turn. Similarly the base game of destiny 1 gives about a quarter of its time to each race but with more emphasis on the Vex, I expect they'll do the same with destiny 2-4 (roughly a quarter of each game given to each race but with more emphasis on cabal, hive and fallen in turn). So, by the time the final DLC comes out in ~9 years each race will have 1 base game, one expansion and 4 DLCs dedicated to it. That means, by race, we still have: Fallen- 1 game, 1 expansion, 3 DLCs Hive- 1 game, 3 DLCs Vex- 1 expansion, 4 DLCs Cabal- 1 game, 1 expansion, 4 DLCs Still to come That means 5 Fallen raids, 4 Hive raids, 5 Vex raids and 6 Cabal raids. I'm guessing around 15 strikes per race. Somewhere in there we're going to fall out with The Circle Of Nine too. Come 2025, this games going to be epic.