For the Sony 'e-mount' lenses (i.e. the NEX/super compact family), the lens library argument would be valid, ... but for the a-mount/alpha/Minolta mounts that the A65 uses, there are well over 100 lenses available, including several Zeiss and G lenses, which are fantastic, plus all the Sigma/Tamron lenses, plus all the used Konica/Minolta lenses you can pick up that work on the Sony as they acquired them back in 2006'ish(?).
How many pro photographers have even over 20 different lenses? Pick a lens type you want/need, I'll bet Sony has it, plus there's a ton of Sigma/Tamron ones too. I've got 6 different lenses from macro to super zoom, and still 99% of the time most of them stay home while the 18-250mm goes on every trip.
I just think that anybody that doesn't give the Sony/DSLT option a fair shake is missing out, and most people that comment on them have never even used one. Roll down to Best Buy or camera shop and play with the Sony A58 or A65 a bit, you might find yourself pleasantly surprised. Live LCD display? 25600 ISO? Full panorama in camera? 10fps shooting? 24mp? Oh, and don't forget.... phase detection video (that's right, it will autofocus while recording video, very cool). And, you don't need to worry about buying lenses with image stabilization, 'cuz it's built into the Sony body vs. the others.
I'd suggest that those features alone are more important to the enthusiast than having 200 vs. 120 lens options available to them. Once you find your go-to lens like I did the rest will sit around collecting dust anyway.
This site is good for doing comparison shopping:
Canon 60D vs Sony SLT A65 - Our Analysis