I'd like to see something new.
I'd like to see a Kershaw balisong.
The market's wide open.
The most inexpensive quality balisong on the market right now is a kit balisong that goes for about $70, although there still wouldn't be any competition until about double that, when you get into Benchmade territory.
Or, inexpensive is good too. Many people are turned away from balisongs since there are no balisongs worth flipping between cheap Chinese junk and the $70 kit balisong.