Usually as the clutch plate wears the bite gets higher as yours is doing. However, this could also be adjustment and/or hydraulic problems, so the only way really is to get it seen and appraised by an honest mechanic. The other issue that is also linked with a wearing clutch plate is that it gets harder to push the clutch pedal down. If the bite is also very quick then again suspect the clutch is worn.
A friend of mine has a Trafic with similar mileage and he has had to replace his clutch recently. Of course, they will want to do the whole job of replacing the clutch and release bearing at this mileage as there will be wear anyway.
As suggested, I would personally have a go at bleeding the system first. Don't forget to top up the system afterward.
Spruce