I believe this is way simpler. Using interfaces will coral your datastore code into one location. Then, you only need to change that code in a very modular way. Heck, give the job to a friend and go for a walk. You can review the changes he made later without worrying that he crossed your routes up. Heck, you can even run your tests (same tests as before since you are using an interface) against your new datastore.
