Would it be practical to produce both versions?
I can think of conditions where I would have uses for either/both.
Many Amigans who own classic hardware have multiple machines. Some of mine have ethernet and some don't. One has USB.
If you put a Algor/Norway in your classic and already have a Z based graphics card I don't know if having slots on the Coldfire are an absolute necessity unless you really are a display and network speed junky.
Personally, I'm more interested in increasing my processer speed for applications than I/O to cards.
I'd be much more interested in having an integrated USB 2.0 and Firewire on the Coldfire.
If that happened and someone wrote a Firewire stack it would be practical (without extra boards) to write a non-linear video editing app or port the recently released Toaster edit code.
Processor speed, firewire and USB 2.0 for cameras and decks...that would be cool.