Not much would happen, depends how it fails:
If it was slipping and finally lost all drive (total wear) then you would just lose acceleration and come to a slow steady stop, but you will have warning of this because it will probably have been slipping for a few days before hand.
If the pressure plate or release bearing failed then it would just be very difficult to change gear
If the hydraulics gave up then again difficulty in changing gear, but you could still drive in the gear its in (unless you had to change gear for a hill etc)
to be honest, while your cruising along at 60mph presumably in the one gear, its very unlikely the clutch will fail, usually it will wait until you start using it.
If your clever and know how to synchronise the gears you can easily drive without a clutch pedal at all, I've driven hundreds of miles in a car with no clutch pedal.
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