in a few years the majority of the eu will be fine without russian gas. it takes time and the war just accelerated these processes, so there are difficulties. but since multiple countries (finland, poland, denmark and probably some others too) weren't willing to pay in rubles, they aren't getting any gas from russia for months and they still managed to get supplies from elsewhere.
also, russia can't really dictate everything on the gas market. gas isn't like a bottle of wine, once you start exploiting the gas fields, you can't stop the production, so they will need to find buyers. i read some analysts saying that the worldwide consumption won't change too much, supply chains will adapt though: russia will sell their gas outside of europe, and europe will buy from the us, plus algeria, norway and from other smaller producers.