Not many, I think. The biggest customers specified exactly what they wanted in terms of performance, & the A400M matches what they asked for. The French, for example, pointed out that in Mali, they could have delivered troops & their equipment to where they'd fight, while C-17s had to land several hundred km away, & a lot of equipment had to be moved overland from there because it wouldn't fit in a Transall or C-130.Had Boeing doubled or tripled the whitetail production run, I wonder how many pending A400M orders would be at risk of being cancelled? As Boeing had to be aware of some of the problems, IMHO, they pulled the plug a little early.
I don't see them discarding that - what they wanted & asked for - because of a fixable technical problem.
Also, there's the little point about where A400M is built: the jobs are in the main customer countries. The politics of dumping it are poisonous.