What happens when a SSD reaches its write limit?

I'm planning on installing a SSD in my laptop, but before I buy one, I'm curious as to what happens when a SSD reaches its write limit?

I'll be using the SSD as my primary drive with all of my programs installed on it, all of my music, my photos, my documents and everything else I'll be working with. I'm going to be doing a lot of video editing, and working with software such as Pro Tools and Ableton Live. The drive will constantly be accessed and the laptop will be on for several hours each day.

How long would a Crucial M500 960GB SSD last under this kind of workload? And when the SSD reaches its write limit, would it be possible for me to clone the drive onto a new SSD to keep everything intact?