There is a post about it [x], but like you said, I’m pretty sure
this is a reference to the unofficially-binding 2014 Veneto referendum. The
post was created in 2015. 

The nations follow the decisions of their government, so it’s
not really up to the personification. Although, in the panel, Veneziano doesn’t
appear to be too opposed to the idea of it.

I don’t think anything would happen to be honest. They were
already characterized as separate nations in the first place, not to mention
that a recent World Stars chapter has already shown that Romano has his own
boss [x].