Take all the above ideas, shake em up and I get this:
If Polaris was to spin off the Indian brand so it stands on its own (apparently), and design a very powerful, light and high tech inline 4 engine. I'm talking about an engine that is going to get attention. A torque monster. Then offer it to begin with, with an innovative chassis, high tech suspension and killer brakes.(Later, several versions based on this). Go ahead and use all that electronic crap I hate but the market seems to love like ABS, traction control, etc, etc. Make it look a bit nostalgic in a classy way but definitely modern, state of the art even....
This could sell. The bagger version would likely be a market grabber.