A one-state solution is “never” going to work because that’s the current solution.
Again, that's not what "one-state solution" means. "One-state solution" necessarily implies, for one, that there is a current problem in need of a solution; it would be extremely strange to say "The solution to the problem is the status quo."
When people say "One-state solution", they generally mean a single state encompassing all of Palestine and Israel with equal rights.