Williams hasn't condemned the ECUSA exactly, mainly since it's an open secret that he's in almost entire agreement with them substantively if not procedurally; not all of the Catholics are going to Rome (and there are also Roman Catholics who come into the Communion out of disgust at how Rome does things); and as long as the Church of England is culturally closer to the North American Churches than to the African Churches the likeliest result is an eventual fracture between the liberal/Anglo-Catholic factions and the Evangelical factions, not the Evangelical factions taking over. Honestly, I don't see why we need the Evangelical factions, spiritually speaking; they can just bugger off and become Pentecostals if they keep being ungrateful to the Instruments of Unity for covering for their sorry asses. A Communion run by the Evangelical factions is a prospect that simultaneously baffles, sickly amuses, and terrifies me.
The proper head is of course the Archbishop, and the Queen has no authority whatsoever, even technical, over parts of the Communion other than the C of E.
His constant warnings to them have gone completely unheeded. Whether he agrees with them theologically is immaterial, he realizes that the actions taken by the ECUSA (and to a lesser extent the Canadians) are the real cause of disunity in the communion. If there were any avenue through which the ECUSA could have been punished it would have been, I don't see how anyone can argue otherwise.
An evangelical takeover isn't a remote possibility, it's almost a near certainty. The ECUSA is dying rapidly and the only vibrant churches in the CofE proper are evangelical (either conservative or "open"). The idea that somehow the ECUSA and the CofE's liberals could somehow form a sustainable communion apart from the evangelicals in Britain and the global south is fairly specious, and would be far more schismatic than the conservatives have been. ACNA is a special case, they're in a kind of limbo right now, no one really knows what's going to happen with them.
The problem going forward for liberals isn't that there are conservative brown people far away in Africa causing trouble, the problem is that there is enough of a contingent in England (and in the US) that sees these people as closer to them than the liberals in their own country. Conservatives like N.T. Wright standing up and saying "nothing justifies schism" is the reason the thing hasn't fallen apart, they've been open to working with everyone in spite of having the ECUSA spit in their faces.
Also, I don't particularly understand your connection of Anglo-Catholics going to Rome and Roman Catholics leaving the RCC to become Episcopalian/Anglican. These two groups' motivations for moving are completely opposite.
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