While I am against sanctions as they are completely useless, Europe will eventually figure things out and find the replacement. It won't of course happen over night but it will in a couple of years. If this drags on (and it probably will), life standard in Europe will go somewhat go down, while Russia will crumble like USSR did since they learned nothing from that failed experiment.
LOL.. so you are saying that Europe will find replacement in the next couple of years. What will they do until then? Maybe they will travel in donkey carts and heat their homes by burning firewood? And there is no guarantee that they will find replacement in the next 24 months. It is very simple. There is not enough supply of oil and natural gas in the world, to replace the supply from Russia. It is Europe that is going to crumble, not Russia. And already the signs are obvious. Now the catch here is that Russians are used to a life of hardship and difficult economic conditions. But can the Europeans deal with such conditions?