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When steem hits a hundred, the competition for Steem will be intense. Ready?

yeah steemit is still beta , so its still in development, a great project with a interesting Idea but as you said once steemit passes a line there will be a lot of competition .
And one is for sure big companies like facebook,twitter already now about steemit and they will fight back.

I think most people take the steem here they get for granted as they think it will always be easy to get. The price iis currently 8.90. That means to buy a thousand steem it is going to cost 8900 dollars. to earn a thousand steem now?

you are absolutely right, we already see that people are trying to scam, spam or beg for votes , I just can immagine what will happen when more people will join.
Now there active user base is still small so its "easier to gain momentum" but to earn 1000 steam will take you a lot of time even if your content is great.
Steem is a project where the community needs to step up otherwise it can fall apart. Just my 2 cents

I think the reward calculation needs to change and factor in author reputation.

A part of the problem is people have been buying their reputations through upvotes.