It's likely the 1.4 gs, or even more the 0.6 gs on the inside seats,
would be objectional but that can be overcome by controlling the roll
banking into the turn. Maybe someone can refine your 20 degrees of
roll per second estimate and tell us what is typical in normal
operations of a large airplane. More importantly it would be
interesting to know if limiting the angular acceleration would have
important safety comprimises in normal operations.

The people who sit in the center section of a wide body are at 3 to 5
seats from a window. Although they may object to not having a window
they nominally pay the same as a window seated person, and if the
window seated person pulls its shade all are deprived of the view even
if sitting one seat away. I doubt the window proximity issue will have
a serious effect on the market. When we travel by a part 135 carrier
we choose flights based on convenience and price, and don't even
consider if the airplane is a wide body or not. Do readers of this
newsgroup consider the type aircraft when buying tickets as a primary
factor in choosing a flight?