There are couple of problems with your reasoning as far as I can see:
Jehovah has always used some form of organization and mediatorship to fulfill His purposes upon the Earth as it relates to spiritual direction. Examples that you probably think of immediately are Moses, Joshua, David, and Samuel, amongst other faithful servants found within the Hebrew Scriptures. In later times he used a governing body of faithful and experienced Christians to resolve disputes and provide spiritual direction.- Acts 15:22-31. That said,why wouldn't Jehovah do the same today?
But does god always have an organisation to use? In, for example, the 14th Century, what was God's organisation on earth?
There is no organization other than Jehovah's Witnesses under the direction of it's Governing Body, that is, spreading the good news of the Kingdom (Matt 24:14)
For Jehovah's Witnesses, the good news of the kingdom means preaching that Jesus Christ began ruling as King in 1914, and that we are now living in the Last Days. Then after Armegeddon, there will be a Great Crowd of survivors here on earth.
Why do Jehovah's Witnesses believe that Jesus started reigning as King in 1914? They beleive that 1914 marked the end of the Gentile Times that ran for 2,520 years from 537BCE to 1914CE. And that 537BCE comes from a 70 year period from 607BCE to 537BCE.
But 607BCE, when Witnesses believe that Jerusalem fell is wrong. Totally. The evidence is overwhelming. It is wrong.
With regards the Great Crowd they go to heaven. There are before (enopion - in sight of) God's throne, in Naos, the divine habitatiion (heaven).
So you see, the Witnesses message of the good news of te kingdom is utterly flawed. So you have to ask youself whhen has God ever sent his people out to preach falsehoods in his name?