A depressing, but realistic outlook that takes into account the person receiving the advice.
Believing a person has those talents? Well, if they did, they'd probably already make their own game. So, the suggestion is still fairly worthless. It's generally at the epitome of worthlessness when only "make your own game" is offered, and slightly less so when encouragement is offered and little else. I mean there are resources out there that can be offered to bolster the sincerity, and effectivenes of the suggestion.
I.E.
http://www.gamejamcentral.com/
http://www.geany.org/Download/Releases
http://www.mingw.org/
http://www.blender.org/features-gallery/
http://www.gamedev.net/page/getstarted.html
http://www.reddit.com/r/gamedev/
(Credit to Vortex_Cortex for the links. I probably didn't use them as well as he did though.)
The resources are out there, at least in terms of programs, and ways to ask for help.
Regardless, if the person the suggestion is made to lacks in critical areas of development (Again, Time, vision, resources, etc.), it all falls apart.
If the world of game development was as great as people try and make it seem, we'd all be doing it, and we'd all be rich, and/or happy. It's just not the case, though.
Again, the suggestion is steeped in ignorance, no matter how well meaning it is. I can imagine not many people fall for that warm gushy "you can do it!" stuff.
The often blind optimism behind the well meant suggestion is annoying to me, honestly. Especially as a person that's heard the suggestion many times. I don't imagine I'm alone in this, as a lot of people aren't able to take advantage of the advice. Pressing the matter just gets obnoxious.
Yeah, making your own movie is still easier said than done. You still need a lot of the ingredients required to make your own game, especially the most important stuff like drive, vision, creativity in script and movement, time, money, and either the graphical art skills to create an animated cast, or charismatic people to be the cast, the latter much harder to obtain, IMO.
Portal? I won't deny it's existance as an example, but that is a short list for a somewhat dated game, even counting Portal 2.