[QUOTE][Wouldn't that program have been a great airplane for Boeing's lower size?/QUOTE]
Yes, but Boeing was too arrogant.
When P&W originally offered the Geared Turbo Fan (GTF) to the industry as a potential game changer, Boeing ignored the opportunity as being unworthy of their consideration - after all, the bottom end of the market was not of serious interest to them, so the 60 year old 737 modernised as the 737MAX7 could handle any orders that might fall into their hands.
Also with only 50 units sold after four years of sales effort of the A319NEO, AB accepted that it would not sell and 'bought' the 'nice little C Series' as a complement to the A320-A321 offerings. Bombardier had the only product with 5 wide Y class seating, versus 4 wide on the E-Jets and 6 wide on the 737 and A319.
Airbus is now in a market niche of its own with a new clean sheet product in the 100-150+ seat space, seating 5 wide and offering, superior passenger comfort, superior seat mile costs and reduced fuel burns. It nicely complements the 170-180 seat A320NEO and the 210 - 230 seat A321NEO.
Boeing was in the same position with the B737-MAX7, but could not bring themselves to recognise what the market was telling them. A huge strategic miss on the part of Boeing, which will take them 6-8 years to catch up, with or without Embraer.