I think this idea might appeal to some Germans who are fed up with having the defeat of them endlessly celebrated.... In one way, I must say I understand that...

I like the CIS area tradition simply because of the music and because it's a bit like a spring festival for people... But frankly the war was such a long time ago and the military aspect of the celebrations don't appeal to me at any rate...

But practically nobody in the EU has any strong feelings about it, and nobody can be bothered to celebrate a European national day.
Their only hope of achieving this is making it a work/school free day across the EU and organise some really good celebration that appeal to people.