Well isnt the 750 being introduced first in markets outside of north america? I don't know I think the 500 could give the 750 a run for its money considering the cheaper entry cost and cheaper insurance rates over the life time of the bike...
Especially if the Street 500 and 750 tickle the right consumer feelings like Harley expects they will I think the 500 could see great success in onboarding new Harley clientele...