AMD Bulldozer may be compatible with AM3 boards

And what would he gain? Sata 3 which has any sense only with fast SSD and usb 3 which he could get on controler card for fraction of cost and without headache of changing mobo?

Remember that any time you're discussing this sort of thing that you're a minority, even amongst those who build their own rigs.

There are I suspect, many, many people out there who have built a new system with the intent of upgrading to a new CPU down the road (as I have done) or upgraded their mobo in preparation for a upgrading to a new CPU (which I have not, but intend to sometime soon). In either backwards or forwards compatibility AMD has been a superior choice to Intel over the last half decade as they're frequently allowed both to a greater extent than Intel themselves.

After all, there are motherboards available today that support both the latest Phenom II chips and virtually all desktop AMD chips going back to Athlon64. They support both DDR2 and DDR3 as well.

Can you say the same for Intel? One certainly wouldn't think so. Oh and FTR, socket A was released back in 2000 and it was no longer used by 2006 outside of embedded processors.
 
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FTR Socket A went through a lot of its own developments as well. While in theory a Thunderbird to a Barton could be used in almost all of the boards. The changes to the FSB speeds for each subsequent generation would require a new board to hit rated speed without hacking the CPU to change the multiplier.

As for this current chain of support it goes back to the Athlon64, but there was many a Althon64 and X2 that are not support because of the change over to DDR2. Now if AMD had worked out a process for supporting multiple Memory controllers like they did with the Phenom II, then we would probably have support all the way back to that.

Its fantastic the chain of support that AMD has kept up though on, eventually it will have to end. Don't know if this is it but people can't expect a never ending upgrade options.
 
How about the rumor that from now on, any consumer-level Intel platform socket will only have a 2-year lifespan? Seriously, what is the point of changing the socket every one-and-a-half to two years? Though it is a better idea than changing the VRD spec, rendering older boards useless...

This is simple. As performance goes up and software requirements stagnate and use case goes towards dozens of small tasks. It becomes harder and harder to sell the more expensive and "faster" CPU's. That means margins are falling and now with them back to being the only real supplier on the chipset end, they can by changing the sockets get pretty damn close to a 1:1 Chipset to CPU attachment rate, with a likely but smaller increase in attachment of Intel motherboards.
 
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