For the same reason, moving to 64-bit is no permanent solution to a memory leak - you are just providing more space to leak into, which will only buy time between forced restarts.

If you have enough physical memory and address space, you can allow the leak to continue on the basis that you will restart your application before the process address space is exhausted.

A native memory leak or excessive native memory use will cause different problems depending on whether you exhaust the address space or run out of physical memory.