As a generalisation, as a hydraulic clutch wears the biting point does indeed move higher up the travel, until eventually the clutch pedal is fully released but the diaphragm spring cannot exert enough clamping force on the driven plate to stop it slipping - which is when the latter gets changed. However, the initial biting point, the rate of wear, and the point at which unwanted slip will start, all vary between makes, and indeed from car to car (a bit).
Your clutch may be near to needing replacement, or it may have many thousands of miles left in it. What mileage has your car done, under what sort of conditions (traffic use, slipping the clutch on take-off and for gearchanges, is what wears the clutch; trundling down the motorway in top for mile after mile does not)? How long have you had it, and do you know when if ever it has had a clutch change?
BOF