I believe so strongly in the current and future importance of this that when friends and family add new babies to their families, I have been buying their new child's name with the dot.com extension as a gift if available.
I liken it to buying a piece of land. You might not have any plans for it right now, but at least you control it for future use and options. I believe strongly that having this asset in your control will continue to become more and more valuable in the future. Heck, just to use it as the base for your email is pretty cool Firstname@firstnamelastname.com as your email address. Save yourself from giving out that ridiculous hotmail address you set up when you were sixteen even if you have no other plans for it currently.