I've felt like my clutch has been going for the last 50k. In fact I even questioned the dealer when it was at 30k as its never had that snap and after a sitting in a que going up hill to a roundabout the clutch was always really soft. Something I would expect from an old one but not on a newish one. Ive had the car 9 years now with the same clutch and its always felt the same. I'm on about 120k now and it still feels the same as 30k (soft with no snap) its been bleed many times I might add. Re the DMF, the ones Matt and Vocky have replaced have both been on 1.9 CDTi Vec C's not petrol 2.2's. I really dont think you'll need a DMF, it doesn't get a hammering like the oil burners.
Common sense would say replace them both, but if the DMF has still got miles on it do you realisticly see yourself keeping the car that long for it to fail. I dont think ive seen a dmf fail on a 2.2 petrol unlike the CDTi's.