My first year of winemaking I made the wine by the kit instructions, to include bottling at 8 weeks. My oldest batch is a WineXpert Eclipse Lodi Ranch 11 which will be three years next month. I am drinking a couple batches that are over two years now as well, all made by the book. They are excellent wines, really quality wines. The last year and a half I've been bulk aging, barrel aging, extended maceration and going for the extra umph. Too early to tell how much all of that will add to my wine when they reach two or three years. But I can tell you, that if you make high end kits by the book, and let them bottle age, and they're properly degassed, you will have wine that you can be very proud of in two years, and moreso in three.
Make what you can, how you can, then leave some of them alone for a couple years to really see how they shine. Don't fret over what you can't do.