Do you think many skippers will be interested, given 2.5 years experience? I've been racing on the harbour the majority of Saturday afternoons in that time.
David, as the others have said, the answer is YES - but you need to demonstrate your committment and your staying power. No-one wants to take onboard someone who is only functioning at the start, spends the remainder of the race in their bunk, green to the gills, and then raves about how great they were to all their mates in the pub afterwards.
So.. if you get enrolled in the next SSSC and find out from the club secretary who in the RSYS is going, get their phone numbers, call them and then make the effort to crew for one of them in every race they do between now and then, especially the off-shore races, you've a good chance of getting aboard something mid-fleet.
Depending on your fitness level, you might also need regular visits to a local gym between now and December 26th.. Don't underestimate how much of a hard slog the Sydney-Hobart actually is.
Keep in mind that it's quite an adventure you're about to embark upon and if you make it to the end you'll never forget the experience. Best of luck to you!