Have fun and all that, but really, you need to look at where you want to be 5 or 10 years down the road and decide whether your group of drinking buddies in any way can hamper that progress.
I come from a kind of extreme perspective in that I was part of the group of friends you're referring to in my little social circle coming out of high school and college. A lot of my friends from that time period just kind of passed me by as they grew up and accumulated more and more responsibility as I shirked it every chance I got so that nothing could get in the way of my drinking and drug use. For me, I couldn't do both. I couldn't be successful in life AND snort all the cocaine and drink all the booze that I wanted. So as my group of friends started to evolve over time, I gravitated more and more toward people who had a similar mindset to me. And they gravitated toward me.
When I got sober, the hardest thing to deal with was watching this group of drinking/drugging buddies absolutely disappear. Shit, a friend that I'd known since I was 6 who I grew up around the corner from was the only one out of that group that even had any contact with me at all when I got sober, and even he and I grew apart after about a year. It was hard to handle, but I don't blame them at all. I made a change in my life and demonstrated that I had different priorities in life for once. I didn't really expect them to make that change with me, even though I hoped I could have my cake and eat it too, just like having cocaine, booze AND success.
My point here is that you're in the same position, albeit under different circumstances. In hindsight AND at the time, I didn't harbor any serious resentments toward my friends who moved on while I wallowed in addiction and the partying 8 days a week lifestyle. If I did, I wouldn't have been any better of a friend than those who did NOT move on when I did. You have to do what's good for you and your future. Think of this time in your life as a filtering process where you find out who your true friends are. Mid-20's is a rough time for a lot of people anyways. It's a very transitional time for most and you shouldn't be anything but excited about the fact that you do seem to be moving forward with this transition better than your friends. You don't need to abandon them at all, but you need to understand that part of this transition is learning that your true friends would never do anything to belittle your progress or hamper your chances at success. The moment they begin to do this is just part of that filtering process.