If such an event is so likely as to make a manned mission impossible then what's the likelihood we'd have two electronic rovers that have been successfully operating on the planet for years? Spirit worked for 6 years and continued to operate for an additional year after becoming stuck. Opportunity has been operating for 9 years and is still going strong. So, at best, the premise that electrical discharges are a problem is still valid but hardly justifies the statement that such a thing is impossible. Secondly since such discharges are point source rather than frying everything on the whole planet perhaps we could take along spare parts? Which you'd have to do anyway since somethings are so critical you don't actually wait until they break but you replace them automatically around the time of the first mean time between failures.
Admittedly a different sort of problem than what we were facing with the Apollo mission but something we've been dealing with in space at both the ISS and the Hubble.