Willie,
You can drink the maple-flavored Kool-Aid! Ut not the whole bowl, please.
The B717 and Fokker 100 didn't sell well, either. The Fokker 100 brought down the company. There just isn't a big market for 110-130 seat airliners anymore. Of all types, fewer than a 1000 built over the last 40 years. The A318 and short 737s are less efficient, but still no market.
The US carriers don't want that size plane because it is not profitable with mainline costs. Put in regionals, at regional costs, maybe; but ALPA will never allow it.
It'll be a technical succes and a market failure. Like the other French 100-seater--Dassault's Mercure.
GF