The negativity is bound to happen as a site reaches the scale that Digg has. I must say I really enjoy your how-to posts like these and think they transfer well to other server-side technologies.
As someone who has spent a lot of time with ColdFusion (and still tinker with it from time to time), I must say while I don't think it will die completely, it will have trouble gaining any further share. I had the most fun of my career working with ColdFusion, so I have no hard feelings. But, if you're a Linux shop, you're probably going to go with PHP or Rails. If you're a Windows shop, you're probably doing .Net. Also CF is a tough sell for enterprise apps, I don't even really buy it.
But really, it comes down to cost. It can be very difficult to get budget managers to pay for CF when there are free options available, no matter the productivity gains may be gained. That one roadblock is enough to stall its growth. I'm running MX now, but will be migrating apps to .Net so that I don't have to worry about not getting $$ for a future upgrade cycle.
just my $.02