I know from real life experience that it is possible to burn out flash memory.
I was involved in the testing and debugging of a product that had embedded linux running
from a flash memory system. We found out the hard way that if we turned the event logging
all the way up, it would overwrite the log files often enough that after a number of weeks
the flash memory would start failing. Fortunately, we were using CF memory cards, so it
wasn't a huge deal to replace the flash.
"He's just this guy. You know?"