I went back and did more research on what "ATI" might be worth today and whether AMD overpaid. I did so by reviewing NVIDIA's performance.
What I found grosso modo is: sales have doubled; they've generated well over $6B of cash flow which they've used to pay dividends and buy back shares to the tune of over $4B; they've strengthened their cash balances by $2B; and their market cap today is $10B.
In my opinion, its not unreasonable to think had AMD left ATI alone, with almost no growth sales today would be in the $600-700MM range quarterly, they would have generated substantial cash flow over the years, and they'd still be worth at least $5B.
The narrative that AMD overpaid for ATI simply doesn't pass the smell test. At all.
Did they mismanage it? Absolutely, as only they know how.
Did that acquisition allow AMD to survive a few more years? Absolutely. Without GPU, AMD would have ceased to exist a few years ago because no APU and no console designs. Edit: they probably knew this when they bought it.
The scary part is if the old AMD is jettisoned, ATI can resume where it left off, growing the business, making money, generating cash flow, with the market cap of ?B. Two things stand in the way: the WSA and LTD holders. For LTD holders, if somebody makes the case to them, they won't stand in the way, why would they? Its a better business model. Global Foundries? Not so much.