Comment No, but... (Score 4, Interesting) 522
The short answer is no.
The long answer is probably no, as you need a certain mix of incredibly talented people with very specific attributes. Valve is notorious for only hiring the absolute best, going for those with wide specialist knowledge (but shallow knowledge of all other aspects of game development... some kind of "T" metaphor is used by them?), and ensuring everyone they hire can be an effective leader/is capable of following an effective leader when needs be. And you can't just have a few people with those attributes; everyone in the company has to be like that.
If you can hire only people that meet the above qualifications, then sure, you could make another Valve. But it's a very difficult (or at least expensive) proposition, and no doubt incredibly challenging to scale.