Is it your contention that God will essentially remove the seal from an elected individual?
The mistake people make is wrongly defining the "Seal of God" as some container fused shut in which we are trapped - A "seal" is a "sign", a "token", a "mark" which identifies us as God's property, like Abraham who "received the
SIGN of circumcision, the
SEAL of righteousness..." And, what is it? God's law:
"Bind up the testimony, seal the law among My disciples." Isaiah 8:16 KJV
The Holy Spirit is the Sealer that seals us with God's law - meaning when we surrender our will to God, the Holy Spirit writes His law on our hearts and by His power Jesus lives out His perfect obedient life through us - which obedience is the "sign", "seal", "token", "mark" to all men which identifies to them Who we serve, according to 2 Corinthians 3:1-3 KJV.
To answer your question, if we withdraw our surrender and go back to serving our will instead of God's will, we are no longer sealed by His law, because we rejected the One Who only can empower us to live according to it.
P.S. - the
Mark of the Beast also has to do with the law, but that's another thread.