Lots of assertions, zero supporting evidence, plenty of evidence already provided contradicting them. On Soviet Air Defense:
Also worth noting that David Holloway states that by 1948 Soviet early-warning nets covered the approaches from the west, with them expanding to cover the southern and eastern approaches during the course of 1948-1949:
"In July 1948 the National Air Defense Forces were converted into a separate service, on an equal footing with the Air Forces, the ground forces, and the Navy. The country was divided for the purposes of air defense into a frontier zone and a zone of the interior. Responsibility for air defense in the frontier zone was given to the commanders of the military districts and to the Navy. Defense of the interior was the responsibility of the National Air Defense Forces. Early warning radars were first deployed to cover the approaches from the Baltic and Eastern Europe; by 1950 the radar net had been extended to the Pacific Ocean, and to the Caspian and Black Seas." David Holloway, Stalin and the Bomb, Pg 236
The claim that 6-8 bombers would be able to deliver it's bombs is similarly contradicted by a wartime exercise in early-1949, where not a single plane managed to successfully complete the mission:
What made the Soviets pause wasn't the atom bomb. Both Soviet political and military leaders repeatedly dismissed the atomic bomb at this point as a important factor in a war, a analysis largely shared by their American counterparts:
"Stalin did not abandon these principles after the war. He told Alexander Werth in September 1946 that atomic bombs "cannot decide the outcome of a war, since atomic bombs are quite insufficient for that." 7 Since Stalin wished to minimize the significance of the bomb, this statement cannot be taken as proof of his real views. But he had received several reports in 1945 and 1946 about the effects of atomic explosions, and although these drew attention to the destructive effects of the atomic bomb none of them portrayed it as a decisive weapon." Stalin and the Bomb, Pg 225-226
-Holloway, 238
As Holloway ultimately concludes: "Soviet and American military planners agreed in 1949–51 that the atomic air offensive would not win the war." (Pg 240) and the bomb brought about "no radical shift in the Soviet conception of war." (Pg 250)
What deterred Stalin was not the atomic bomb, or at least not the atom bomb specifically, but rather concern about American economic strength in a long war. In conclusion...
You'll likely want to take your own advice.
I've already cited scholarly sources which state otherwise. Until you provide something of similar quality, your just blowing smoke.
Sure. They can recall it. The problem is that they don't have the means to execute it for the first year or two. I've already discussed extensively at the West's state of their strategic air forces and their failure to wreck the communists supply lines in Korea despite facing a weaker opponent and more favorable air conditions. The claim that the Soviet logistic links are creaky and vulnerable have not been substantiated in any manner and certainly they are much more robust then the North Koreans and Chinese, not to mention better protected. Now over the long term, the West will rebuild their strategic air forces to their wartime strength and then their conventional and atomic attacks will wreak absolute havoc on the USSR but in 1948, there's little they can achieve.
Neat way to contradict yourself there. As you yourself obliquely ascknowledge, if the WAllies call it quits when the Russians hit the channel then they have "won a war of some duration", just not one of long duration. You are correct that the US would ultimately outproduce the USSR once it gears up and over the subsequent years, the US would rebuild it's forces and eventually grind down the Soviets and this was sufficient to deter Stalin. It's not strictly true that all attention can be diverted to Europe: the Middle East and East/Southeast Asia might become theaters depending on how the Arab States and China swing, but it's true enough since American efforts in these theaters would be secondary and largely defensive.
At most, it will take the USSR a few days to shift it's forces into a offensive posture and launch their to-the-channel offensive. History shows that it will take the west many months to dispatch reinforcements of any substance. The massive difference lends itself to the conclusion that the West simply cannot. So yes, a quick march to wash their feet in the channel is still very much a realistic outcome even in a "spirals out of control" scenario.