Considering how Russia hasn’t really been reacting to most of what the US and co has done against them, the US likely is confident nothing will come out of it like in most of the other times they did things against Russia, thus, the US will probably escalate this within days. Like many of the other times.
It might not fall overnight but a quick devaluation of the dollar, perhaps with big US tech companies losing value due to Chinese ones and with big countries pushing for other currencies, followed by a successful military attack against the US or their interests when they can’t do anything about it could scare people away of the dollar and break it enough in a week though.
But anyway, I guess will see how it goes down. But down it will go.