Most hard drive I see in consumer and business use write far less than that over their lifetimes. I have a customers hard drive I am copying data from currently. Has 15,147 power on hours, it has only written 1.3TB of data. It's very uncommon to see drives with over 6TB of data written (in the 500GB to 1TB drive range).
The other client SSD in my computer is a Samsung 830 256GB SSD that I just migrated to a 1TB SSD for a customer. Was used for about a year and a half before they needed a bigger drive. They used Outlook, a number of Autocad applications, lots of project files, a good sized collection of work related photos. The drive has 995GB of writes and is showing no SMART issues.
Average computer users have nothing to worry about when it comes to wearing a SSD out. Power users might have a problem depending on the nature of their work, but they also get the most benefit from high write speeds and IOPS. Servers, depending on their usage patters could have a problem, I certainly recommend the enterprise style drives that reserve a much larger amount of space.