You think that potentially finding out that an alien life form was responsible for creating life here on earth will solve the question of the origin of life? Isn't it obvious that if that was the case, then the next logical question would be "who created them" and so on?
It would solve the origin of OUR life, but not all life. But dismissing it no matter what and never attempting to check if that is a possibility if it actually is will ensure we never get the answers. Let's say we create an artificial/robotic life form. Thousands or millions of years from now the Earth is a desolate waste but this artificial robotic lifeform were made to replicate and create new ones as older ones eventually died. They can dismiss that another life form ever created and became their origin and try to forever figure out how metals and circuit boards evolved from something floating around on the desolate Earth but the fact would be that a biological lifeform had existed and created them long ago. If they figure that out, they found the truth of their origin. They still won't know where life originated but they'd be a step closer.