I can understand your points, but they seem a little odd in the context of where the A220 or E190/195 might be used. You won't find 787 or A380 aircraft flying most of the routes where these smaller aircraft will fly.

On many of these routes the 737 is over provisioned and Boeing is not really winning the deals on the merits. You can see Boeing cozy up further with Embraer since that's been on the cards for a long time and then they'll be able to offer something other than the 737.