Well, you'd have at least one customer for each of those. I'd love to see it happen.
As you may have noticed, Reason has just added tempo and meter mapping, so version 4 is much better suited towards arrangements than earlier versions. The sequencer is also much improved.
My favorite thing is that if you use Reason and pop a couple of gigs of RAM into a regular laptop, it can handle a pretty complex arrangement quite easily. I simply haven't been able to get that sort of efficiency out of other DAW software and plugins. Yeah I can do a partial arrangement, but with Reason I can just go crazy with barly a blip of the CPU meter.