Interpretate the post as: What if the economy in the USSR was better than OTL?
Better how? Scrapping central planning and introducing free market wouldn't make it better for sure because 'free market' is not a flat modifier from a video game.
Khruschev was actually in position to improve Soviet economic foundations but he failed in the end and was removed. Central planning was never a problem for the Soviets, their main problem was subordination of civilian economy to a defense sector. Which introduced a lot of weird dynamics in how Soviet economy operated.
Also I must note that it is not about 'Soviets spent over 9000 percent of their GDP on the military' because all these estimates that float around are simple bullshit calculated on the basis of not very well-educated guesses. The problem was that majority of Soviet budget spending was controlled the what you can call a 'military-industrial complex' (of very different nature that US had and still have) and while it was still spent predominately on civilian things and for civilian purposes, there was always a background element of optimization of everything for military production and military conflict.
Khruschev attempted if not to combat this nascent (at his time) military-industrial complex but at least attacked one of the pillars of its influence - large conventional military. If Khruschev succeeds at that, the influence of the military and military industry in the Soviet economy will fall
naturally which will lead to a more balanced development later. Historically Khruschev fall to a double strike of internal resistance and Cuban Missile Crisis after-effects which doomed his push towards smaller military that relied on nuclear weapons as a main deterrent.
Remove Cuban Missile Crisis from the equation, keep Khruschev in power for several more years for his reforms to solidify and you will improve Soviet economy down the line.