Maybe this new arrangement would make that phenomenon worse, but it already happens now, doesn't it? I've long thought that there should be a sort of grab bar hanging from the overhead locker, like you see on subways, to help people who have difficulty staying balanced while entering and exiting the row.
If you have ever flown economy, you will know that it's standard procedure for the middle and aisle seat to move to the aisle if the outer seats have to use the restroom.
Even with straight seating there's no way to exit (in economy) without vaulting over multiple people, and this assumes they aren't using tray tables.