Q2: I thank God for your answer as it is the only Biblical one. It demonstrates that you understand that the Bible has to rule our theology in all matters, and especially in salvation.
That said, what is the ultimate fate of those who, as you say, "disobey Christ" and do not exercise the discipline of separation as you have outlined it in your opening statements?
A2: Since salvation is based on God’s grace not on our works of obedience, such people will still be saved and will be with Christ.
Nevertheless, such disobedience is contrary to God’s will and therefore they may invite chastisement by God for their sins (Heb. 12:10-11). Also, the works of their service and/or ministry will run the risk of being burned up and their rewards lost (1 Cor. 3:15)