I'm not a Soviet apologist, but the state of eastern europe has roots that predate the 20th century. Bear in mind that even before communism, much of it had been part of Tsarist Russia in the 19th century or earlier.
It's inaccurate to think of pre-soviet europe as composed of western european style states.
I can't imagine this growing beyond a fringe movement. Countries are pretty attached to their languages, I doubt it would accomplish more that aggravate eurosceptics: The european nationalism one of the quoted proponents dismisses is a pretty powerful force that hasn't exactly accepted the degree of integration these Latin-advocates envision.
Also, the history in this article is so atrocious I had to write a blog post about it.[1]