In the rapidly evolving landscape of healthcare provision, the rise of online therapy for anxiety disorders presents an intriguing trajectory. The advent of digital platforms has fundamentally transformed the way we perceive, access, and deliver mental health support. This shift towards virtual mental health care, abetted by the global pandemic, has unarguably come as a boon for those grappling with anxiety disorders.

Before delving into the future predictions and emerging trends of online therapy for anxiety, we must establish a foundational understanding of its significance. Online therapy, also known as e-therapy, teletherapy, or cyber therapy, involves providing mental health services via the internet. This mode of therapy is often employed to treat anxiety, a chronic condition characterized by excessive, long-term worry and fear about everyday situations. Anxiety disorders are the most common mental illnesses, affecting 18.1% of the U.S population yearly. The embrace of online therapy is a response to the manifold societal and individual challenges, from the dearth of accessible mental health services to the stigma that still taints mental health issues.

In the forthcoming years, this burgeoning field promises to offer a revolutionary avenue of healthcare provision. There are several predictions and emerging trends worth discussing.

• The use of Artificial Intelligence (AI) and Machine Learning (ML) in online therapy is one such trend. AI and ML algorithms can analyze behavioral patterns and predict episodes of high anxiety, enabling timely and personalized interventions. Notably, this shouldn't be seen as the replacement of human therapists but rather as an aid to complement their work. These advanced technologies may be an effective solution for addressing the acute shortage of mental health professionals, but they're not without tradeoffs. Challenges include potential privacy issues, ethical dilemmas, and the need for extensive validation before widespread implementation.
• Moreover, the integration of Virtual Reality (VR) in online therapy is another innovative trend. VR, a simulated experience that can resemble or differ from the real world, has been increasingly utilized in 'exposure therapy' for anxiety disorders. This method involves exposing patients to the source of their anxiety in a controlled environment, eventually helping them overcome their fear. While this technique allows patients to confront their anxieties safely, the VR technology still needs further refinement for an improved user experience.
• Online therapy is also expanding its reach via mobile applications. The recent surge of mental health apps, utilizing cognitive-behavioral therapy (CBT) techniques, are designed to help manage symptoms of anxiety. The apps are not only cost-effective and easily accessible but also offer the convenience of on-demand therapy. However, the quality of these apps is highly variable, and a substantial number of them lack empirical support for their efficacy.

In light of the above, it is clear that the future of online therapy for anxiety is multidisciplinary, integrating advancements from various fields like AI, ML, VR, and mobile technology. However, it's essential to ensure that these innovations are grounded in rigorous scientific evidence to ensure their safety and effectiveness.

Furthermore, the advancement of online therapy also calls for revised regulatory frameworks to ensure ethical and legal compliance. Questions of confidentiality, consent, data protection, and cross-border practice will require novel solutions that accommodate the digital nature of online therapy while upholding the rights and welfare of the patients.

Lastly, it is important to acknowledge that the increased acceptance and utilization of online therapy do not mean the obsolescence of traditional face-to-face therapy. Instead, it opens up a new arena of 'blended therapy' where online and traditional methods can complement each other, creating a more holistic and inclusive approach to mental health care.

In conclusion, the future of online therapy for anxiety is teeming with potential, brimming with innovative technologies and techniques that could revolutionize mental health care. However, this path forward is not without its challenges. It requires a keen balance between embracing innovation and maintaining rigorous scientific, ethical, and legal standards. The promise of this field lies in its ability to offer effective, accessible, and personalized mental health care, moving us towards a future where no individual has to face the debilitating effects of anxiety disorders without support.