Yes

• What do Christian thinkers believe about heaven being eternal?

  They agree heaven is eternal - they just disagree over the meaning of the word
• What does Aquinas argue about the eternity of hell and heaven?

  He believes the beatific vision of God is eternal which stretches to infinity
• What would the view of hell and heaven being eternal allow an escape from?

  The idea of heaven being boring as there would be no time to fill