The Aryan invasion theory has yet to be proven. Although there is linguistic evidence for the spread of peoples from a central European homeland throughout Asia and Africa, there has been no concrete evidence to support the theory of an invasion. This remains a fruitful area of study for the future.
No, the Aryan invasion theory is not a valid premise for the spread of humanity from Africa to Asia, because it is racist and stereotypical to assume that all white people just want to attack and take over others. The people who explored back then were probably white because the white countries had better economies and the time and were more able to explore. Race had nothing to do with it.
I do not believe the Aryan invasion theory is a valid premise for the spread of humanity from Africa to Asia. I do not believe there is any evidence of this theory that really holds ground. Furthermore, Indian history, that found in the Vedas and other documents, never mentions an invasion of any type.
Race was virtually non-existent in early history. Furthermore, many of the invading forces into Africa during early history came from Asia into Africa rather than the other way around. Aryan contact did not take place until en masse until the viking invasions. It is, therefore, not a valid premise for explaining diasporas from Africa into Asia.
The Aryan invasion theroy is not longe a valid premise for the spread of humanity from Africa to Asia. It is now believe that all human started in Africa so there could be no invasion. It is also believed that humans migrated to Asia in search of more food and resources.