Monetary reform is a very long process and it may take 2-5 years to get implemented. Moreover, if American government was planning to do something like this, we would have known it a lot earlier from media and news. I don't think these type of decisions will be made by any government as there will be a massive protest against it by the whole crypto community. Monetary reform will take a long time and it needs a difficult process to be implemented with already Trump government having a shaky stance, they wouldn't think of, doing a reform of bitcoin. As, most of the population will go against them.