I'm in two minds about this.
On the one hand, I see the benefit of HD systems and appreciate the stability of the software (my recent experience with 9 written about elsewhere here and certain releases which really sucked notwithstanding).
On the other, one of the biggest complaints--associated with the price--is that HD is an old technology. So I suppose something had to change soon and I guess HDx is it.
Now those who've seen my recent posts know I have a cheap Magma chassis which I was hoping to fill with PCI cards, but since the original HD cards won't be supported past PT10, I'm not sure this is wise. (...unless 10 turns out to be everything I could ever want and would never want to upgrade again). So Avid just blew my plans out of the water.
A similar situation, and quite recent too, is the dropping of support for the PPC platform. What really sucked was Avid doing it on a point-point release with bugger-all notice. ("BTW, chaps, 8.0.3 will be the last PPC-compatible release". Hell, they could have waited until 9.) At work we went through that pain less than a year ago and now we'll have to look at completely replacing our hardware maybe a year from now. How hard would it have been to maintain PPC / HD support for 2 years longer and give people lots of notice of having to do it all in one fell swoop.
I just saw
this:
Q: Is Pro Tools 10 a 64-bit application?
A: No. However, Pro Tools 10 supports 64-bit hardware drivers for Avid interfaces, enabling you to use your Avid audio interface with 64-bit Mac and Windows operating systems. We understand how important 64-bit is to many of you, but at this time, Pro Tools 10 is still a 32-bit application to support Pro Tools|HD TDM systems and older ("blue") Avid Pro Tools|HD interfaces. Because these older hardware systems will not support 64-bit, it was important for us to do one final Pro Tools release at 32-bit and deliver the highly requested features and performance enhancements to everyone.
So, there's a reason for not supporting original HD cards or interfaces (but I bet there'll be months of arguments on Gearslutz about whether the claim is valid). Now I reckon that could have been announced a long time ago (especially as many people have been talking about it), without giving away too much about HDx.