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This is actually a good idea, but either way, I think Steemit is going to the same direction even without the recruitment incentive bonus.

Yes, I agree :)

That would make Steemit grow exponential but if it's already growing like that then why rush that?

Most likely if they did decide to implement this, it would not be something that would happen right away. It would probably take 6 months to a year for them to develop/implement. It is a well known goal that the community wants this to take off and become the next Facebook, reddit, etc. The current growth is amazing as it is, but something like this would help take it to the next level.