Having had a rear wheel drive car for a long time, I was certainly not fussed about wearing down the rears - give me oversteer any day over uncontrollable understeer - as long as the fronts had grip you could aim the car where you wanted.
I can't think the same would change in a front wheel drive car, and to be honest if you are driving within the limits of the road conditions, your ability, the handling of the car and the remaining rubber on your tyres, you won't run into these problems. If not, no amount of rubber is going to save you when you get it all wrong - front or rear.
Personally I would change tyres purely on a financial basis - fronts wear quicker, so put the new boots on the front lengthening the time you need to visit the garage again.