[Cronos]

well, then you'd have to account for the fact that the S-E asians aren't Ainu, they are mostly Mongoloid with some Caucasian blood (courtesy migrations from Southern India).

However, there is the Tamil (South Indian) myth about the Dravidian peoples coming from an Island in South-East Asia that submerged around 7000 B.C. -- and the Tamil language has cousins that are found in coastal areas -- Brahui in Baluchistan (Western Pakistan / Eastern Iran), and supposedly, Harappan and Sumerian.

This is a point brought up by Blam before that I increasingly find to be true: it could be the source for the Ainu (some Dravidians moving east up to Japan) and accounts for the fact that India has two Caucasian branches (Aryan and Dravidian) with Dravidians being mostly in the Eastern coasts and up the Indus river and also for the fact that Sumerians seem quite distinct from their Semitic successors, the Akkadians / Amorites.

[blam]

"However, there is the Tamil (South Indian) myth about the Dravidian peoples coming from an Island in South-East Asia that submerged around 7000 B.C. "

That could be Sundaland.

Oppenheimer said that the strait (forgot the name) there at Singapore opened (rising waters) in this period allowing these refugees to sail toward India, etc. for the first time.