Again.. you don't HAVE to do them. I'd rather have more options than less. Having another choice is better than there just being a juggernaut of 90s dungeons.
What I'm saying is the rewards ARE there doing alternative content. So that choice is yours. You wanna run dungeons for em? You can do either though yes, one is far more efficient. But it's still entirely up to you.
I don't think smushing them together and denying people the option to do one or the other (or both!) is a great idea.