I really am a fan of boxed sets. Despite the possible financial impracticality of it all, I'd really like to see their come-back. Lands of Intrigue, and the Planescape Boxed Sets are some of my favourite things of all time, and they remain treasured possessions.
I'd want another Lands of Intrigue for any of the 5e books.
You could do then they would just cost a lot.