Most people, I find (excluding -- obviously -- the intelligent, thoughtful, and good-looking people who hang out here) have a very poor understanding of what "obsolete" actually means, at least in terms of computer equipment. What it doesn't mean is that it will stop working, or you should throw it out immediately. What it does mean is that Apple will stop manufacturing new repair parts for it, relying instead only on refurbished and harvested stock, and that these machines are likely (that's "likely" not "certain") to be off the list of compatible hardware in a year or two for the latest OS update. For parts and repair purposes, "obsolete" just means "five years old" and almost certainly unlikely to be covered by any warranty, and optionally any extended repair program.
For the typical Mac owner who may have one of these units, it means very little in the near term. Repair parts will become harder to get in a few years, and your machine will be off the list of systems that can run the latest OS (and thus, a little later, latest software) in a few years. Very occasionally, some kind of huge hardware shift occurs (like the switch to Intel, which was -- what??! -- 10 years ago??!), which "ages" old Macs a bit faster, but broadly speaking if your 2010 machine is performing to your expectations today, nothing much will change for at least a couple of years. After that, however, it's probably time to start looking at a newer Mac ... even if the one you're using is still running acceptably. Best time to upgrade is when things are running and just slow, rather then when you are, um, up a polluted creek without suitable means of locomotion.
For the typical Mac owner who may have one of these units, it means very little in the near term. Repair parts will become harder to get in a few years, and your machine will be off the list of systems that can run the latest OS (and thus, a little later, latest software) in a few years. Very occasionally, some kind of huge hardware shift occurs (like the switch to Intel, which was -- what??! -- 10 years ago??!), which "ages" old Macs a bit faster, but broadly speaking if your 2010 machine is performing to your expectations today, nothing much will change for at least a couple of years. After that, however, it's probably time to start looking at a newer Mac ... even if the one you're using is still running acceptably. Best time to upgrade is when things are running and just slow, rather then when you are, um, up a polluted creek without suitable means of locomotion.
but i'm over all pretty happy with it. 
