Well guys, we're just going to have to agree to disagree on this one.
How I interpreted Goh's ambition (dream) was to catch every pokemon in order to research and connect with them while working on his goal to catch Mew along the way. He never said that Mew would be the last pokemon
he would catch if ever he got close to catching all Pokemon. He simply said he would catch every Pokemon as he worked his way
towards getting a Mew.
How I see it Mew is being treated now
as a stepping stone towards his dream to catch every pokemon.