The idea of all living things forming one big organism involves the end of evolution via natural selection, due to the lack of independent actors for there to be competition between.

I have some essays explaining what I think is meant by the idea:

http://alife.co.uk/essays/one_big_organism/ http://alife.co.uk/essays/self_directed_evolution/ http://alife.co.uk/essays/the_second_superintelligence/

Like you say, you seem to be talking about something quite different.