I don't think they were really trying to do a replacement so much but it just had some similarities. For the average user, the two bags are different and have different buyers.
Personally I prefer the Dreamer because it is lighter in weight, and it conforms to what you are carrying better than the Rogue. For example, if you carry less, the Dreamer then is smaller in size when you carry it but it still works. If you carry more, it all fits. The Rogue, and I only had the Rogue 25 but gave up every single one, was too cumbersome for me. It was too boxy and a little hard to get into for me personally.
As nice as the leather is on the Rogue, I don't personally need bags that all have that same kind of leather. I like all of my Coach leather bags, and never found the Rogue to be better, just different. That is just me, though.