A two-state solution has failed multiple times, including during the Oslo accords. Israelis and Palestinians simply cannot handle a two-state solution, and it always leads to violence in the end. Trying something over and over again that has been shown to fail multiple times is a waste of energy and lives.
Even if public support is still in favor of a two-state solution, this doesn't necessarily mean it is the best solution. Average citizens may not be informed or knowledgeable on the subject, and just because the public wants it doesn't mean it's realistic. Even if the public hopes for it, that doesn't mean it will work. A realistic solution designed by diplomats and experienced policymakers, not random citizens, is much more effective.