Nigh unto cursing, or another rendering, close to being cursed...is one rejected from salvation? the kingdom? or fellowship, communion with God or union with God? This verse is very much in the air in what is meant by "close to being cursed" and "whose end is to be burned", this sounds like the one "who has fallen away" has removed him from receiving the blessing of God while yet he/she lives. God wants to bless His children, but He can't while they are run a muck, in which everything this person does isn't worth anything pertaining to His Kingdom. Their life is useless. It could be the work that is burned up, not the man.
1 Corinthians 3
14 If anyone’s work which he has built onit endures, he will receive a reward. 15 If anyone’s work is burned, he will suffer loss; but he himself will be saved, yet so as through fire.