I agree, that's an interesting point actually.
Everything Ronaldo does, he seems to make it look easy. After watching a few of his long range goals and free kicks, anyone could be mistaken into thinking they could go out and hit a few like that if they tried.
The most under rated skill is the step over imo, he does is to such quality and to such speed, to replicate at that level would take a hell of a lot of practice, and I think you could match him, because he got to that level in the first place by practice, but as I said, it would be a hell of a lot of work.
I also think that Messi is very much the same case, the close ball control he has, he makes it look simple, when in reality if you try running at that speed with the ball that closely, you are more likely to fall over then go past players. I think Messi's skill could be replicated because he is only as good as he is because of practice and experience, nothing else.
In terms of playing like him, kids on the play ground can try and play like Ronaldo or Messi, but whether or not they will actually play like them to the same quality and skill level is a completely different story.
Either way I'm against trying to play like other players, learn from others, create your own.