I have not read anything where someone has claimed the fan blades will melt; they will overheat, and become brittle, increasing their rate of natural wear.
This is not something that will happen in one flight, and with the right inspection procedures can be monitored with a good degree of reliability.
Your maintenance bills will go up, and you will be down for more service periods; I don't believe anyone claims this is something that will happen in the midst of a single flight in 8/8 skies.