HENCE - the MD80 is no longer a certifiable design because of not only ice injestion, but also because of blade out which was demonstrated recently in a fatal uncontained engine burst which took out a row of passengers and also the adjacent engine on the other side of the galley ! You will never see another one of these configurations unless the engines are staggered ( the RUssians have patented this configuration - no one will pay them royalties ) .. even Bomb has indicated that there new RJ will be a wing mounted engine design - abandoning the CRJ200/700/900 config. Makes sense as well from structural efficiency standpoint as well .. IE no need to make 10 meters of systems runs from service centers located in front of airplane ( wing root & EE bay ) to tail ..