I agree, it is an interesting subject, especially given that at least some of the basketball world probably thinks Larry wouldn't be as good today. Of course that shows why so many players are busts in this league. While athleticism is nice and certainly looks good, players like Gerald Green, Kedrick Brown, Jerome Moiso, Harold Miner and countless others have shown to prove that no amount of athleticism (and size can be lumped in here too) can make up for a lack of talent.
On the other hand guys like Steve Nash, Tim Duncan, and Paul Pierce all go to show that you don't have to be the most sculpted, fastest guy in the league to dominate it. The Celtics themselves are somewhat of a testament to this idea. While guys like Rondo and Garnett are certainly athletic freaks, guys like Pierce, Allen, Perkins, House, and especially Powe and Baby all showed that it was more brains and will power than natural gifts.
I think that's been Danny's strength in the drafts. With the exception of Rondo, every time he's been wowed by freak athleticism (a la Green and Banks) he's been let down. But when he's gone with undersized and less athletic guys with a higher skill set (like West, Gomes, Powe, Baby, Allen) he's done well for himself. All of this goes to show, of course, that it's skill that matters much more than size, strength, speed, and hops.
All of this is why Larry Bird would still dominate today. Moreover, Larry certainly wasn't as unathletic as some people would think. He had underrated hops and strength and was deceptively quick.