While Jehovah's Witnesse feel that heaven is "full" that is not based on sound interpretation of the Bible.
They get this idea from Rev. 7:1-8 where it refers not to salvation (offered to people regardless of
race) but to 12,000 people from each specifically named tribe of Israel. And it pictures their being
sealed ON EARTH during the great tribulation period. That's all it says. Pretty simple... does God know how to say
what he means? Rev. 21:24-27 pictures all the "saved" in the new heaven and earth scene, with access
to the very throne of God.
For discussion of other JW errors, click here Honest Questions JW