The write count is not a problem : write count exceeded, change drive, copy data, done. It's not like the drive will explode once the threshold is exceeded. And chances are that you will never encounter this problem unless you have a *very* intensive usage.
Perhaps more problematic is fading. Flash cells lose charge over time, and the more you write, the more "leaky" the cells become. That's why we say that the number of writes is limited, because past a certain point, the manufacturer cannot guarantee that the data will stay for more than X amount of time. FYI, X = 1 year for the Intel 520. Note that that's 1 year powered off. If the drive is on, the cells will be periodically refreshed, making the actual duration much longer.
But SSDs are not the only kind of storage medium that lose data over time. Magnetic storage is slowly erased by the earth magnetic field, reflective layers on CDs oxydize, etc... It means that the only way to ensure long-term data integrity is to actively maintain backups, or, if it not possible, use special archival grade storage media. Archival media can be of any kind : (EE)PROM, magnetic, optical, paper, ... but optimized for long-term storage at the expense of other things like storage density.