In the dynamic world of web development, Ruby on Rails (RoR) continues to be a leading choice among developers for its streamlined, practical approach to building high-quality web applications. This industry report delves into the current trends, key findings, and critical insights surrounding this popular framework and the developers who wield it with mastery.

Ruby on Rails, often simply called Rails, is a server-side web application framework written in Ruby, a high-level, interpreted programming language. Rails employs the Model-View-Controller (MVC) architectural pattern, providing default structures for a database, a web service, and web pages. The primary advantage of using Rails is the abstracted complexity, allowing developers to focus on the unique elements of their applications rather than getting bogged down with boilerplate code.

However, the power of Rails extends far beyond simplified code. The Rails Doctrine, penned by the framework's creator, David Heinemeier Hansson, focuses on principles such as programmer happiness and convention over configuration that have significantly influenced the Rails community. These principles engender an environment where developers can create robust, scalable applications in a time-efficient, enjoyable manner.

One may surmise that the popularity of Rails could correlate with the number of developers using it. However, a closer examination presents a nuanced picture. While numerous languages and frameworks have surfaced over the last decade, Rails remains a stalwart presence in the developer community. According to the Stack Overflow Developer Survey 2020, Rails holds a solid position in the top ten most loved and wanted web frameworks. This suggests a strong continued interest and satisfaction among developers with Rails, despite the emergence of newer technologies.

Yet the demand for Rails developers is not uniformly distributed. Certain regions, especially those with emerging tech industries such as parts of Asia and Eastern Europe, have noted a growing demand for Rails expertise. Conversely, tech giants like Silicon Valley and New York City have seen a shift towards JavaScript frameworks like React, Angular, and VueJS. This could be attributed to the rise of single-page applications (SPAs) and the broader trend of JavaScript domination in the tech industry.

Interestingly, the median salary of Rails developers paints a picture of a rewarding career. According to Payscale, the average salary for a Rails developer in the United States is about $82,658 per year. This suggests that despite any geographical shifts in demand, Rails expertise remains a valuable skill in the job market.

But what of the future? With the relentless pace of technology, can Rails maintain its foothold in the world of web development? It's speculative territory, yet certain indicators point towards a sustained relevance for Rails. The recent release of Rails 6.0 introduced features like Action Mailbox and Action Text, along with multiple database support, which signifies an active effort to keep the framework updated and relevant.

Moreover, the Rails community remains committed to improving and refining the framework. Regular updates, a plethora of gems (libraries in Ruby), and a helpful, active community indicate a bright future for Rails and those who choose to master it.

In summary, the world of Ruby on Rails developers is one of dynamic resilience and continuous evolution. Notwithstanding the rise of newer technologies and geographical shifts in demand, Rails continues to carve out a substantial niche in the web development landscape. For developers, maintaining Rails proficiency promises lucrative returns and a promising career path. As for the industry, be it startups seeking rapid prototyping or established firms looking for robust, scalable solutions, Rails continues to be a compelling choice.