Let's take the Crucial M4 64 GB as an example, a very common SSD. Host writes so far: 546,1 TiB (see http://en.wikipedia.org/wiki/Tebibyte). That's about 600 TB. If you use the SSD for 10 years, you can write:
365 * 10 + 2,5 (leap days) = 3652,5 days
600 / 3652,5 = 0,1642710472279261 TB * 1024 = 168,2135523613963 GB a day
If you consider an SSD dead when the MWI reaches 0 (although it's not), host writes are limited to 170,8 TiB or 187,8 TB. You can write:
187,8 / 3652,5 = 0,0514168377823409 TB * 1024 = 52,65084188911704 GB a day
That's only a 64 GB SSD, 128/256 GB versions should have double/quadruple memory cells and write capacity. Now go ahead and try to write 50 GB on your SSD in one day, let alone daily. Any questions?
And don't forget, the bulk of SSD workload is read access, which is unlimited.