The thing is, this isn't a $60 game anymore. It hasn't been since the Dark Below came out. This game is changing as it goes along to try and figure out the best solution. If you don't buy an expansion you shouldn't expect to be able to reach the new level cap since you did not buy it. If anyone locked you out of something, it's yourself and you did it simply by not buying the DLC. Since you didn't, now you don't have a nightfall when its a new DLC nightfall, and you don't have access to what the rest of us paid for.