As we delve into the world of pool building in Las Vegas, we find ourselves standing at a fascinating crossroads of engineering, aesthetics, and environmental consciousness. This is an industry that is simultaneously rooted in the norms of conventional construction and yet, constantly jostling with the boundaries of innovation. As we peer into the future of pool building in this vibrant city, we discern interesting trends and predictions that merit our attention.

Las Vegas, often dubbed as the oasis in the desert, has an arid climate with year-round sunshine making it an ideal location for residential and commercial swimming pools. This high demand has created a booming market that has attracted a plethora of pool builders. These pool builders, in turn, are constantly challenged to deliver not only functional design, but also visual appeal, and environmental efficiency.

The most prevailing trend that is poised to shape the future of pool building in Las Vegas is sustainability. While the term might be thrown around quite liberally across various industries, in the context of pool building, sustainability refers to energy-efficient techniques, resource conservation, and environmentally-friendly materials. The relevance of sustainability is borne out of the increasing awareness of climate change and the global shift towards renewable energy sources.

For instance, the implementation of solar-powered heating systems is gaining traction. These systems, powered by Las Vegas’ abundant sunlight, offer an efficient and green alternative to traditional gas or electric heaters. Furthermore, the use of variable speed pumps, LED lighting, and automated systems can significantly reduce energy consumption. As per the law of thermodynamics, the energy saved in these processes is not lost, but rather, it is translated into monetary savings for the pool owners over the long run.

Another significant trend surfacing in the pool construction industry in Las Vegas is the incorporation of smart technology. It's not enough to simply build a pool anymore; the consumers of today, shaped by the fourth industrial revolution, demand pools equipped with advanced technology. Digital automation systems that can control everything from water temperature, lighting, to cleaning and chemical balancing are becoming de rigueur. It’s an intriguing marriage of technology and convenience, inspired by the principles of IoT (Internet of Things), that is destined to redefine the pool experience.

In terms of design, the future holds a transition from traditional rectangle or kidney-shaped pools towards more free-form, natural-styled pools. These are designed to blend seamlessly with the surrounding landscape, employing elements like artificial rock work and water features. Resort-inspired features such as beach entries, infinity edges, and swim-up bars are also gaining popularity, indicating a shift towards more luxurious and experiential designs.

The evolution of pool building in Las Vegas is also significantly influenced by the economic dynamics of the area. Las Vegas, with its robust tourism industry and an increasing number of high-net-worth individuals, presents a favorable market for luxury pool builders. However, it also demands a high degree of creativity and customization from them.

On the other end of the spectrum, the rising cost of living and income disparity necessitates more affordable pool building solutions. Thus, the future will witness a greater push towards cost-effective methods of construction, such as fiberglass pools or vinyl-lined ones, which offer similar functionality at a lower price point.

In conclusion, the future of pool builders in Las Vegas is set to be a dichotomy of sorts - an amalgamation of luxury and affordability, tradition and innovation, aesthetics and functionality. It will require builders to find a fine balance between these contrasting elements to stay relevant in this evolving landscape. As we move forward, it will be interesting to see how these trends shape the city's swimming pool industry and how builders adapt to these changes. One thing is for sure – pool building in Las Vegas is heading towards an exciting, transformative future.