Yeah totally. I've lost count how many folk have said stick 3 litre gubins in. But not wanting to. I want to keep it stock as possible but also have it working as best it can.
followers become dished though don't they? I'm thinking after 15 years they'd be quite dished?
Wear will be a function of mileage and oil change interval rather than years.
Did you have to take the heads off when you had the problem doing the cambelt? Did you inspect the followers then?
Have you got a set of old ones you can put a straight edge on to check?
If you were working on an old school engine (for example a Rover V8) you would find the cams and followers to be worn out after 70,000 miles. The Omega V6 seems to be made to a higher standard and (barring failure of the lubrication system) you should find the cams and followers to be almost un-worn after 200,000 miles.
When I changed the cam cover gaskets on mine at 130,000 miles I couldn't see anything amiss & I am not planning to pull it apart again any time soon (it has now done 205,000 miles and feels as it did at 130k).