SSD longevity is not worth worrying about, and very nearly never was. Even with all the die shrinks reducing individual flash cell durability, consumer drives of moderate capacity still have write lifetimes exceeding a petabyte. Even a brutal workload of keeping the drive full and using it for lots of swapping won't wear it out before some other critical component of a 4GB machine fails. If you've got a very early and small SATA SSD you might be able to wear it out but the most likely mode of failure is going to be controller/firmware crashing, not NAND cell failure.