Usually leaking gaskets only get worse. The worse the leak, the faster the oil is contaminated and the more damage will be done to engine bearings, camshaft etc.
With the limited info you have provided, I don't think it will last 2 more years without repair.
Realistically, $1000 to get another 2 years out of a car is a reasonable cost. Furthermore, if its in decent running shape at that time, it still might be worth something to sell, so you can get some of the repair money back.
If you just let the engine destroy itself, your car will be worth almost nothing.