Oh I don't know P, a worn clutch looks like.......well it looks like a clutch that's worn, but that question is moot, as you'd need to get it out to check, which is at least half the cost of a swap. You're right that there have been failures reported for other reasons. The ones I know of are down to finger springs, though I've not heard this in relation to a QP. I'd agree with Drewf and, given I don't trust the readings above 50%, I'd drive it until the car starts to hunt gears, squeal, drop unexpectedly to neutral, or starts to flash the gear selection.