This paper investigates the transformational influence of Artificial Intelligence (AI) on language learning, framed within the theoretical perspective of Krashen's Input Theory. It explores how AI technologies impact the development of core language competencies among second language (L2) learners, mainly focusing on reading, writing, speaking, and listening skills. By synthesizing existing literature and discussing empirical studies, the paper delves into AI's potential opportunities and challenges in language education, particularly within the Nigerian context. It examines how AI-powered language learning tools, such as ChatGPT, contribute to language acquisition and proficiency and evaluates their effectiveness in creating language-rich environments conducive to learning. The study also addresses concerns surrounding bias, accessibility, and ethical implications associated with integrating AI in language education, proposing recommendations for educators, policymakers, and developers to ensure responsible implementation.