To create a national state there must be a nation around which the state can be created. Do you know many people who call themselves Ruthenians (Rusyns)?
It seems that you are absolutely misinformed about the situation in that region. It is hard to find another country in Europe with that anti-Russia stance that Ukraine has
To my understanding, when Czechoslovakia was created, they were called Rusyns, as you are saying, and added to the land borders of Czechoslovakia. I speculate, that now after separating the Czech Republic and Slovakia, it would be logical to separate the rusyns too. I read somewhere at another thread or a blog, that the rusyns were running discussions about how to set up an independent government, and it was about the choice of a one house or two house setup like the uk.
Maybe this. If the Ukraine is totally anti Russian, then Russia would support the further break up of the Ukraine by supporting an independent routhenia. This would be more difficult to sell to the EU, I guess, but maybe Poland would be on board, because south east Poland is now a part of the Ukraine.