I share Wingnut's cynicism about the economy class squeeze finally being over. At the end of the day, in any aircraft, from 737 to A380, you are effectively renting floor space on a plane when you fly. Want more space, pay more; want to pay less, put up with limited space.
Likewise for airlines, the challenge is to arrange that floor space in a manner which maximises their revenue and profitability; that's why 10 abreast 777s are taking over from 9 abreast and why 9 abreast 787s are far more numerous than 8 abreast (still JAL only). All of these artists impressions of cosy interiors are marketing bumpf - not necessarily dishonest, because Boeing intended the 787 to be 8 abreast - but just not what their customers had in mind.
Airlines will look at the 797 as they look at any other aircraft: how can we optimise this space to get best return: attract high revenue pax and accommodate as many lower paying pax as safely possible. That's not going to change with the 797 (or any other aircraft).