I think the main concern of the Russian internet users is to get isolated from the rest of the internet indefinitely during peace time, in a way of China or North Korea. I am not sure we are seeing signs that the Russian government intends to go that far yet.
The Internet is a vital infrastructure element. Leaving the risk of potential disruption to some US congressmen's whims is not a very wise choice. Of course it can be used with bad intentions as well but so can anything else. I think I've already mentioned this in my older post and it was downvoted eagerly.
This is a claim made by the Russian government with little actual support as far as I know. It comes up every once in a while when the issue is mentioned, and is usually uncritically accepted.
https://www.forbes.com/sites/kenrapoza/2015/01/27/russia-to-...
I don't know that statement's veracity, but it seems credible.
It looks like you are the one looking for excuse. Following your logic Russia should really wait until threats become very serious then be hit in the face and only then react? I think you're asking a for bit too much Kumbaya.
Here:From the "JOINT MOTION FOR A RESOLUTION" from the European Parlament ( https://www.europarl.europa.eu/doceo/document/RC-8-2014-0118... )
" 12. Recalls that the restrictive measures taken by the EU are directly linked to the Russian Federation’s violation of international law with the illegal annexation of Crimea and the destabilisation of Ukraine, while the trade measures taken by the Russian Federation, including those against Ukraine and other Eastern Partnership countries which have recently concluded Association Agreements with the EU, are unjustified; calls for the EU to consider excluding Russia from civil nuclear cooperation and the Swift system; "
Now as far as it concerns the Internet there is even no real need to bring Swift example. Any country would be insane to let their Internet infrastructure under someone else's control. Question of course how much it will cost to build a replacement for situations if the things go sour. So for many countries, especially the ones that are on friendly terms with the US, they can let it slide. Not so much for Russia, China etc.
The news is that they can now isolate their Internet domestically and run a Russia-only WWW. They presumably could have shut it off completely from Day 1.
The utility of the web isn't the protocols it technology employed; it's the content.
I can imagine online banking with foreign entities would become a problem as well.
There are also media of a more liberal nature who can’t comfortably host in RuNet / being registered as Russian companies, so they exist outside. meduza.io being a prominent example