Hey Rich, I agree completely.
Airlines like to buy families of airliners. Witness the 737NG or A320 ranges.
The current 717-200 (as good as it may be) is a bit of an orphan. A 717-100 and/or a -300 would offer the family concept to prospective customers. It would also indicate Boeing's continued commitment to the 717.
I see Air Tran and AA (assuming they end up being happy w the ex-TWA 717s) as being logical/possible 717-300 customers.
I dumped at the gybe mark in strong winds when I looked up at a Porter Q400 on finals. Can't stop spotting.