In the realm of web development, Ruby on Rails (RoR) stands tall as an innovative framework that has significantly contributed to applications across the digital landscape. Its impact reverberates from small-scale projects to mammoth-sized applications like GitHub, Shopify, Airbnb, and Hulu, among others. The evolution of RoR, coupled with its adaptability, bespeaks a promising future. This calls for a thorough analysis of future predictions and emerging trends in RoR development.

To begin, let's decipher the whole Ruby on Rails paradigm. Ruby is a high-level, interpreted programming language, lauded for its simplicity and elegance. Rails, on the other hand, is a server-side web application framework written in Ruby, built on the Model-View-Controller (MVC) architectural pattern. Essentially, RoR is a combination of Ruby programming language with Rails framework, which makes web development faster and easier through the provision of default structures for databases, web pages, and web services.

Contemplating the future of RoR development necessitates a look at possible advancements and trends. The first prediction pertains to the rise of API-only applications. In our connected digital world, APIs have grown in importance, acting as the bridge for communication between different software components. RoR 5 introduced API mode, which significantly eases the process of building API-only applications. As the demand for mobile and single-page applications continues to skyrocket, the importance of robust APIs will only increase, making this feature of RoR even more critical.

Secondly, the future of RoR might see an enhanced focus on security. In an era where data breaches and cyber threats are a regular occurrence, RoR provides an array of safety features that help developers build secure applications. These include protection against cross-site scripting (XSS), cross-site request forgery (CSRF), and SQL injection, among others. The evolving landscape of cybersecurity threats necessitates constant reiteration and enhancement of these security measures in the RoR framework.

Another notable trend is the increasing interplay between RoR and JavaScript. The integration of Rails with JavaScript libraries and frameworks, such as React and Angular, has led to an improved user experience while retaining the benefits of Rails. This trend is likely to persist and grow stronger as the JavaScript ecosystem continues to evolve at a brisk pace.

Additionally, we cannot overlook the potential influence of big data on RoR. As the world increasingly becomes data-centric, the ability to handle and process enormous volumes of data efficiently is imperative. Although RoR might not be naturally predisposed to big data applications, integrations with big data technologies, such as Hadoop and Spark, could broaden its scope.

From an economic standpoint, RoR has the potential to continue playing a significant role in startup development due to its cost-effectiveness and rapid development capabilities. The ability to quickly prototype and iterate makes RoR a preferred choice for startups looking to bring their ideas to life swiftly and economically.

In terms of employment, job trends show a consistent demand for RoR developers. The continuous evolution of the framework, along with its widespread application, ensures that proficient RoR developers will remain in demand. However, it's important to note that professionals in this field will need to evolve in tandem with the framework, adapting to the emerging trends and advancements.

As we gaze into the crystal ball for Ruby on Rails, it's clear that its journey is far from over. The trends and predictions suggest a vibrant and dynamic future, where RoR continues to adapt and evolve. While no one can guarantee what the future holds, we can anticipate and prepare for it. For developers, this means staying abreast of these trends, sharpening their skills, and remaining adaptable in this ever-changing digital world. For businesses and organizations, it means leveraging the potential of RoR to create robust, secure, and efficient web applications. As we embrace the future, one thing is certain: RoR will continue to leave its indelible mark in the sphere of web development.