How long until my transmission goes out?

I have a 2000 mitsubishi eclipse. I'm a mechanic and I specialize in Jaguar, Volvo and Land Rovers. I'm also ASE certified so don't mind using automotive terminology. I have been doing all my oil changes, with eueropean synthetic, and all the maintainance. The car has 135000 miles and has a techtronic 4 speed transmission. Can this car make it until 150000? or am I driving it on borrowed time? The transmission has Mobil one Synthetic transmission fluid (Yes I know Amsoil is better), and the car hard shifts into reverse. Im asking this to know if I should do the big maintainance and a engine overhaul (change all the seals, resurface the heads if I have to) spark plugs, timing belt, wires, distributor cap and all that. I dont wanna do it and have the tranny go out. So.... will it?How long until my transmission goes out?
My brother drove a 1997 Mercury Sable Wagon that he bought from his parents really cheap. He bought the car with the transmission going out and the check engine light on. He never had to fix anything for the 1.5 years he had the wagon. He drove it slow and went easy on the transmission and it lasted him the whole time before it got really bad. At first it would just slip here and there and shift hard. Then it would slip when he would turn. He got rid of it because he didn't want to out money into to to pass the e-check. Just go easy on the car and it should last a good while longer.