It means a major change in planning, since the cost of transition now has to be incorporated. As such, instead of buying a 'status quo' Mac Pro today, one may defer that Mac replacement today to build a larger 2013 budget to encompass the requisite non-Mac hardware + new software licenses.
Yeah, I don't get that... Again, the current Mac Pros are available. If Apple kills it, you buy a PC. If they come out with new ones, you buy that.
Apple's lack of announcement isn't hurting you at all. Even if they announced today, they still couldn't ship you anything.
The automotive analogy would be to drop an engine upgrade into one's existing "old car" investment (Mac) versus holding off a bit longer to then be able to just go buy a whole new car of a different make (non-Mac).
That's a dumb analogy, considering you can buy a perfectly good new Mac Pro today.
Again, no vendor is shipping the new Xeon's today. So you're comparing PCs that aren't out yet vs Macs that aren't out yet.
I'm really not sure what a pre-announcement buys you. Do you have software that only runs on the new Xeons? If not, what's the deal? You're worrying about machines you can't buy from anyone, including Apple.
And if Apple does announce a discontinuation, you can't buy the PC systems right now anyway.
So really, if Apple announced today what they are doing, what exactly does that get you?
That G4 history illustrates how Apple was slow in communicating that they were having serious supply problems...and since 400/450MHz's did ship and there were promises of the 500MHz to ship as well, there wasn't the same uncertainty that there was nothing planned to be forthcoming.
Promises? They took orders for the 500 mhz systems.
And do note that four years later in 2003 with the G5, Apple did choose to communicate with a new product announcement even though they lacked immediate hardware deliveries...these followed two months later.
The reason the G5 was announced early was because it was at a developers conference and they needed developers to ship 64 bit software. They weren't pre announcing it to help people make orders.
Frankly, if I knew for sure that the Mac Pro was going to EOL in 2015, I'd be changing my plans *today*.
Making plans based that far in the future? Oh boy...
I know pro shops having their plans based on hardware makers is tough but...
Eventually anything you buy is going to be end of lived. That includes Windows. That includes OS X. That includes the Mac Pro, iMac, Macbook Pro, and the Dell Precision line. Premiere, After Effects, whatever.
If you're going to buy hardware based on new versions becoming available indefinitely in the future you might as well go back to pen and paper. And even that can be risky.
If your hardware works today, I'd honestly be happy with that. When it's time to replace you can re-evaluate based on exactly whats out at that time.
In fact, we can just make this easy now. The Mac Pro will be EOL eventually. That's a certainty. Could be tomorrow, could be 10 years from now. If that bothers you, just go buy a PC.