If Iran can buy on the regular open market again it is by no means certain they won't buy both from Boeing and Airbus, A330 or B777 iso A345/6.
I really see no serious takers apart from some charter companies or governments for the big 4 engined A340's, the A343 has probably more potential than the A345/6 in the resale or leasing market.
Things might even be worse for the A380 and B744/8 a decade from now.