If I recall correctly NLG was never about the exchange rate.
NLG aims to be used in as many places as possible. It does not matter if you need to pay 10.000 or 100.000 NLG for your sandwich. It matters that you can use NLG to buy a sandwich.

This is reflected in the actions of the team behind NLG. They keep finding new merchants and try not to pre-pre-pre-announce the new merchants or do other stuff to try and get the price up. They deliver. The market follows