Another attack inside the US, and we will probably do the same.
The Reichstag fire scenario works when there is a) a weak or merely surficial democratic tradtion and b) a genuinely chaotic economic situation. Both are true in Russia, neither is true here. It would take a major strike -- e.g. multiple nukes in US cities, before you wound up with this being credible. At least for now.
If it's true, as you say, that the USA would resort to this in the event of another terrorist attack, I would imagine our government would have more than islamists to worry about.
All of politics is local. Shut down local politics and there is no democracy. One national election is easy to rig. Hundreds of local ones is more likely to leak secrets. Abolishing the local ones altogether is not the answer in the USA and it's not going to make terrorists leave Russia. Encouraged by this, rather, they will strike Russia again twice before even bothering with the USA. Targets of opportunity.