AA has an all aisle access setup in F on their 32Ts. The Polaris seat could also probably fit on a 757; the problem is that the half-seat loss at each end is much more significant with fewer total seats (i.e. they probably would have to have 14J instead of 16J).

I still have to run counter to the grain here and say I will miss the 2-2-2 on the 787 when it's gone. While Polaris is better than a herringbone layout, it's still quite unfriendly unless you're flying solo.