You used to have access to them now you don't. Its not rocket science. See, I can do that too. If you fail to pay extra money, you lose features. Again, it ISN'T rocket science. The simple solution is to offer two versions of them. If you don't buy TTK, you get the old version of nightfalls at the lower level and just the old strikes. If you did, you get the new version. Doesn't seem hard to figure out to me. . .