U2FB,
By "..no longer a certifiable design..." do you mean the FAA would not allow another airplane to be built with after-fuselage mounted engines, or do you mean this configuration is not too practical for operational reasons, ie ice, throwing a blade ?
As for the blade incident, it was, in fact, an MD88 if you're talking about the KPNS takeoff where the woman and her child were killed.
I flew the MD88 at Delta until I retired. The failure was traced back to some flaw in the milling process if I remember correctly.
All airplanes have some design features that require "working around" one way or another. The wing ice has been successfully handled ( for the most part ) by heater blankets, improved operating procedures, and an increased awareness of the problem. Can the problem still happen ? Yes, the same way any other airplane's quirks can jump up and bite you if you're not careful.