Although Construct Classic is still as good and as useful as it ever was, Construct 2 has much more potential and is getting way better every month. Scirra's managed to iron out a tonne of bugs that Construct Classic has both in editing and runtime.
It's not good to consider Construct 2 as competing with Construct Classic and vice versa. I often recommend Construct Classic to people still as it's free to get into and learn all the features with, then I advise that once they have a prototype in CC they should port over to the full-version of C2 as it's even better. Construct 2 is well worth the money, especially when you plan on selling your games as they will work on many platforms and content stores almost out of the box. Not to mention, you won't have the headaches of wondering why your game doesn't work on certain computers, or trying to get the users to update DirectX 9 files.
It's fair for Scirra to want to retire CC. This means they don't need to deal with people e-mailing them asking why the program crashes on Vista 3.0 or how to mess with the source code.
I agree with Scirra that CC should always be available on the Sourceforge, but I'm starting to feel the small mention on the "About Scirra" page is enough now, maybe in a few years getting its own page again in a "Retired Products" section, when HTML5 and WebGL is on every device.
Keeping a small forum section like this for those who still use retired products would be really nice though.