To revive and old post since I am interested in this option as well.
The old style of forums made the aggregated forum a little less needed, as it was quick and simple to jump around between forums.
The new format makes it a little less easy to visit different forums.
Given that most people only visit a few forums (as posted by a telerik poster somewhere in the new format discussions) I think that a lot of forums are missing out on other people's knowledge and experience because they aren't seeing the posts in other forums.
An aggregated forum would allow those who don't go to a lot of forums often (I normally only visit the controls I'm having questions about) will have a quick and simple place to view all threads and have an easy way to respond to posts from any forum.
I think the aggregated forum would make it easier for questions to get answered by making an easy spot to view them.
I'm interested in this option; I hope it can be re-evaluated.