Well, 1% of inflation per year would not destroy that argument; at most, it would delay the growth a little. After all, that growth of 1000% per year happened while the miners were creating an inflation of more than 10% per year.
By the time all of the 21 million are distributed it will be a world currency. The price will not rise from new users, it will hold its value.
Keynes need not be involved in the new world currency. He has done enough damage already.