The digital revolution has undisputedly transformed countless industries, and the realm of voice coaching is no exception. As a key player in the music and performing arts industries, the emergence of online vocal coaching has made a significant impact. In this detailed analysis, we delve into the key findings and insights into the online vocal coaching industry, with an eye toward future trends and implications therein.

To understand the landscape, it is crucial to comprehend the transformation of the traditional vocal coaching model to its online counterpart. Traditionally, vocal coaching was a physical, interpersonal experience, conducted in a studio or a student’s home, where the vocal coach, armed with years of vocal training and experience, could analyse and improve the student's vocal technique and interpretative abilities in real-time. With the advent of the internet and digital advancements, this process gradually transitioned to a virtual platform, offering similar training and exercises through video calls, recorded sessions, and other digital tools.

The benefit of this transformation is the democratization of vocal coaching. Geographic boundaries that once limited access to high-quality coaches have been eliminated, providing aspirants from all walks of life with equal opportunities. The Pareto principle, often referred to as the 80/20 rule, can be invoked here to explain the widening accessibility. Traditionally, approximately 20% of individuals with access to quality coaching reaped 80% of the opportunities. This transformation has effectively disrupted this principle, creating a more evenly distributed opportunity landscape.

However, such a radical shift comes with its own set of challenges. The lack of physical presence can inhibit the coach’s ability to accurately assess and correct physical aspects of singing such as posture, breathing techniques and facial expressions. Additionally, the absence of real-time audio-visual feedback due to internet latency can pose a hindrance in providing immediate corrective measures.

Despite these challenges, the continued growth and success of the online vocal coaching industry hinges on the application of innovative technologies. For instance, the implementation of augmented reality (AR) and virtual reality (VR) can fill the void created by the lack of physical interaction, offering a more immersive, interactive learning experience. While AR and VR technologies are still in their nascent stages, the potential for their adoption in this sphere is immense, given the steady increase in their use in various other educational contexts.

Artificial intelligence (AI) and machine learning (ML) are other significant technological advancements that can be leveraged to enhance the efficacy of online vocal coaching. AI and ML can be utilized in assessing vocal performances and providing data-driven feedback, thereby reducing the possibility of subjective bias. However, the adoption of such technologies could potentially raise ethical and privacy concerns, given the use of personal data for machine learning. These concerns necessitate the formulation of robust data privacy laws, aimed at protecting individuals' rights without hampering technological progress.

Economically speaking, the online vocal coaching industry is demonstrating a promising growth trajectory. Using the compound annual growth rate (CAGR) as a metric, the industry's growth can be projected over the next few years. Assuming a positive CAGR, the future prospects for the industry appear bright.

To sum up, the online vocal coaching industry is a fascinating space, brimming with opportunities and challenges in equal measure. As the industry continues to evolve, it is poised to redefine the traditional model of vocal coaching. This evolution, while fraught with uncertainties, is also ripe with potential for creating a harmonious future for vocal coaching, making it more accessible and innovative than ever before. The key to capitalizing on this potential lies in the industry’s ability to adapt, innovate, and navigate through the challenges that lie ahead.