LREM now rebranded as Renaissance - this - and the reasons given for it - seem to indicate that at some level Macron etc share my view that En Marche only succeeded because it was perceived as new and different.
The problem is, of course, that unless it shows itself to be new and different in practice - ie. unless this time Macron radically alters the status quo - it will continue to lose voters to parties that do offer - or seem to offer - real change.