If a mere phone call from the US can force the Russians to abort a plan, they must be seriously running scared, and whatever the US is doing must be working.
The oil glut and the price crash were certainly a major cause of the Soviet collapse, but nobody "thought it up". If you look at the data it wasn't just the KSA that increased production: almost all producers did. The price started dropping, and producers pumped more to try to cover their budgets, depressing the price further. OPEC tried to stop it by tightening quotas, but the quotas were ignored, across the board. Classic case of short-term thinking and distrust for other members of the cartel: the interests of all would have been best served if everybody had cut production to support the price, but nobody trusted the others to follow their quotas and nobody wanted to be the fool who cut production and then got shot down by the combination of low production and a lower price.
The oil glut was catastrophic for all producers, including the Saudis; I don't think there's a serious oil analyst anywhere who believes that it was deliberately contrived as a weapon.
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