I was just discussing this somewhere else. Watchtower has backed themselves into a corner.
A lot of scriptures don't make sense within their doctrine of not going to heaven, like 1 corinthians 15.50 " flesh cannot inherit God's kingdom, nor does corruption inherit incorruption" , unless everything in the NT basically refers to the 144000.
So slowly slowly, as people have realised that and pointed these scriptures out, Watchtower has had to say more and more of it only apply to the 144,000!!