Will people ever learn how to love each other?

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I wonder if the human race will ever reach the level of love which will allow all to accept one another without judgements, criticisms, complaints, vengeance, revenge or other forms of NON-acceptance? Somehow, I have my doubts, unless everyone knew how to focus on the same goals, and everyone had similar aspirations regarding the "life-experience"...(i.e., nobody felt 'envy' toward another, nobody felt 'anger' toward another, nobody felt 'vengeful' toward another, etc.). Is it possible for humans to learn and grow to understand and practice "UNCONDITIONAL LOVE"?