I'm unable recall the last aircraft that didn't encounter an issue in the design, development or fielded phase of its usable life.
Probably because such an aircraft has never existed!
The thread title is, 'F-35 cancelled, then what?'. 217 pages and [nearly] 4 years later and the F-35 still isn't cancelled; it's still going strong as a matter of fact. Meanwhile, this thread has morphed into a soapbox for haters and uninformed critics, some of whom purport to be objective. The F-35 isn't perfect (see my initial point) but I'm confident it will be bloody brilliant and a workhorse of our future air forces; long after Typhoon OSD I'd wager.