I see that lack of comfort also with Flemish people. I have a Flemish neighbour (in her 50s) in Spain and while I'm Dutch I tried speaking it with her but she always switches to Spanish for some reason.
But when I go to Holland these days I hear people speaking a mixture of English and Dutch on the streets. Very American-influenced English though with an accent and some expressions used improperly (I lived in Ireland a long time so I'm more used to British)
It does appear that the language is dying or at least changing. I don't mind though. Languages are meant to be fluid. Trying to be a purist is to try and push back the sea.