...and over half the Bitcoins that will ever exist are already in the hands of such a small amount of people (let's say 1 million?), what would be the repercussions?

As it stands today, a huge chunk of people are left out.

Those who:

- don't have any money to 'invest'
- are without a computer or internet connection
- don't know about Bitcoin
- can, but are unwilling to buy into Bitcoin for any given reason
- are incarcerated, sick, comatose, etc.

The rich can still buy, so they'll never be out of the loop. Besides, they hold value elsewhere which they can always sell for whatever the currency will be.

Forgetting the madness of speculative greed, and just concentrating on those who believe that Bitcoin can one day be the reserve world currency/money-- do you believe that such a disproportion in future wealth is something that's going to be good for humanity?

I always thought that one of the ideas behind Bitcoin would be to somehow 'stick it' to the rich/banks/governments. However, if the best case scenario (or one of them) becomes a reality, the thought of the future disparity makes my stomach turn. As it stands, 1/7000th of the world population already owns 50-60% of the total sum of the future 'money', and most of them are hording.

The possibility of this outcome alone makes Bitcoin the ultimate divider of people and predestines it for failure. The failure can, and most likely will, see it become what it once was-- a niche for a specific type of transaction or completely disappearing, or it will be a failure of humanity on an epic scale.