I am a Microsoft Tech Support Agent
So you have a vested interest in maintaining the public image of MS. You're hardly an unbiased source.

in the time I have been working for this company I have yet to see a single person denied the right to re-activate
Given the amount of time this stuff has been available, that means zip in relation to my point. I'm talking about MS using it to force people to upgrade their software, not to buy new software.

And it has been announced that any product will be allowed to be activated as needed for the life of the product.
Did MS define what the life of the product is? I thought not. So the life of the product is whatever MS defines it as. Meaning MS could decide that the "life" of XP is over at any time.

With Microsofts "minus 2" policy it is very doubtful that any single person will ever find they cannot re-activate a product over the next decade.
Policies change. Especially when there is a lot of money involved. MS now has the perfect method to force people to upgrade their software, and I fully expect them to make use of it.