The economic growth would be only -2% per year as most of the people would hold enough Bitcoin to last them for a lifetime what would eliminate every incentive to invest the money.
I disagree with this; from my personal experience, from reading some of the old masters, and from observation of people I know who have some means, the accumulation of capital does serve as a good launchpad for future projects; indeed, it seems like a healthier alternative to me than relying on credit.
We are animals of burden, not many people will be happy just sitting around and doing nothing, even if (perhaps especially if) they are rich.