Heaven had to be a part of God's plan because he needed a new creation with the proper environment for Himself to dwell with His redeemed creation. The New Creation – "Heaven" – is not a place without choice, desire, or worship; BUT a place with the fullest and freest choice, desire, and worship... Those in Heaven have not lost the capacity to choose wrongly or the capacity to desire wrongly or the capacity to worship wrongly... it's just that they now have gained the perspective necessary so that they might use their choice, desire, worship perfectly in God's full presence.