The dingo is a feral population of the domestic dog, and it was brought to Australia about 5,000 years ago, not 50,000 years ago. The domestic dog was domesticated from a population of the gray wolf about 10,000 years ago, about the same time that agriculture was first invented. The Australian aborigines were among the first Africans to migrate out of Africa 60,000-70,000 years ago. At that time the domestic dog did not even exist. Africans did not bring along dogs with them, because the domestic dog was domesticated in east Asia. Many of the relatives of the Australian aborigines settled in SE Asia but a small group crossed the sea to colonize Australia. After crossing the sea, they evolved in isolation. Meanwhile other humans that migrated out of Africa went to Central Asia, and from there they later migrate to Europe to evolve into Europeans. Other Central Asians migrated east, to northeastern Asia. There they evolved into the Chinese and Mongolians. Later, Central Asians, Europeans and the Chinese migrated to India and SE Asia. There they interbred with the dark skinned, curly haired natives to produce the SE Asians we see today. The dark, skinned curly haired natives still exist in SE Asia, but they are a minority, sometimes found in isolated areas or on islands like the Andaman Island and New Guinea.
The reason Africans migrated out of Africa was because there was a severe drought. During an ice age, tropical areas experience severe droughts but temperatures were about the same, not much lower. The early migrants followed the coastal route from Africa, along the Middle East before arriving in SE Asia and India. They ate shellfish along the way. Archaeological evidence also shows that the Australian aborigines ate shellfish along the shores of Lake Mungo. Shellfish is easier to find and subdue than megafauna. Therefore the overhunting hypothesis may be incorrect. Drought may have changed the climate in Australia and wiped out the megafauna instead. People suggested that Australians may have practiced slash and burn agriculture. But the problem with that is that agriculture was invented in the Middle East almost 40,000 years before the extinction of the Australian megafauna.
Therefore there is really no consensus among scientists as to the cause of the extinction of the Australian megafauna. Humans and the dingo may not have been responsible More research is needed.