Back to the horrible 3+4+3 layout
Not quite, the seats from the old 10 abreast AML days were way heavier and bulkier and there just wasn't the space. Nowadays, even the likes of Cathay (soon) and Air New Zealand are 10 abreast in the B77W as the seat is lighter. If you want the comfort of Economy from ye-olden-days then that's now Premium Economy, with a price still lower than some Y from ye-olde 19 hundred and 90s.