But if you look at high end SSDs, you don't have to worry much about it dying. If it just uses the same couple blocks over and over again, then those individual ones may go bad. But overall, you can get SSDs that will last decades at normal usage- longer than you'll probably want it.

The Samsung 850 Pro is probably the top-of-the-line in reliability (and performance):
http://www.anandtech.com/show/8239/update-on-samsung-850-pro-endurance-vnand-die-size