Don't get too complacent.
From reading some comments and posts both here on El Reg and elsewhere it seems to me as if a blunderbus approach to fixing these snafus is being contemplated.
Even though AMD have said that their CPUs are only affected minimally from what I have read all CPUs will be targeted by the patches whether they need it or not. So that AMD and ARM will be slowed down as well as Intel stuff.
Now it may well be that I have got hold of the wrong end of the stick, and I hope I have, but if true then a lot of collateral damage will done and we will all suffer from this mess.