Probably t The real value of newBTC will also drop by design because all the hoarders see no point in hoarding anymore as an inflationary policy will be applied to newBTC.
Fixed that one for you.
Don't forget that bitcoin is nominally a HIGHLY inflationary currency today (
~11%). Is its real value declining? Sometimes ;-), but not in general. And certainly not "by design".
Real value of a unit of currency does not solely depend on nominal inflation of money supply. You need to consider the growth of the market the currency serves.