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Sadly, if more people come to steemit then the reward pool shrinks then our upvotes become less valuable (in terms of steem). Though buying pressure on steem may skyrocket if hype does it's job, thus compensating for the lost upvote value.

And the reputation system is broken too, it should be based on collective opinion rather than the upvote value as was said here (plus other solutions).

Steemit surely need more work to become mainstream.

Exactly what I fear may happen too.
I'm however optimistic that strategies will be in place soon to counter any negative effects increased population on steemit may cause.