I don’t even like calling that attitude ambitious because to me, ambitious is when you have a skill and want to apply it. It’s not when you want something “really really bad” and have no skills.
Another reason you get the dreamer type attitude is the disconnect from understanding that games are complex pieces of software that take a lot of time and expertise to develop. They currently have perception of being easy to create because a lot of things in our society have moved towards automation.
You will never find anyone on an automotive forum asking how to build their own car brand because most people understand that engineering is hard. Working with metals is hard. Aerodynamics, physics, energy ratios, electric engineering- all the knowledge needed to build a car that you simple turn on and drive, is not a simple feat at all. As a society we mostly respect that and understand the barrier of entry.
Now look at the book or music industry- literally 20 years ago it would cost you thousands of dollars to self publish anything. Now I can order a custom book online for $15. Delivered to my house. If you can read & write, you can make a functioning book now. It may not be great, but you no longer have the prohibitive cost barrier. It’s almost pure content creation, if you can dream it, you can do it.
Games on the other hand are working machines. They have to function, there is a process to organizing that function and executing on it. They are composed of thousands if not millions of parts that are all dependent on each other to execute correctly. But what most end users see is a start button, and a lot of the same features they saw in other games. You get idea that the developer didn’t really do anything because game has guns and levels like the last game. You hear a lot. Gamers saying a developer is lazy. They don’t realize every time a game is made almost everything is created from the beginning. To use the book analogy again- every game is like building the printing press, type setting machine, binder, paper mill AND writing/editing the book- each time a game is made. I understand there are engines to use as a starting point and other features that help process along. It’s no where near the level that authoring is at now.
My advice to any kids wanting to make an MMO or an FPS/RPG/RTS is to either learn a skill first or write a book- because there are literally no limits to what you can write about.