In the realm of opulence and sophistication, the luxury hotel industry in Greece has significantly evolved over the years. A cornucopia of natural beauty, history, and culture, this Mediterranean country also boasts a vast selection of high-end accommodation catering to the discerning traveler's every whim and fancy. We shall delve into the future of this industry, elucidating the predictions and emerging trends shaping the trajectory of luxury hotels in Greece.

The first variable of interest is the advent and integration of smart technology within the hospitality sector. This trend, catalyzed by the fourth industrial revolution, refers to the incorporation of artificial intelligence, machine learning, and Internet of Things (IoT) in hotel operations and services. For instance, predictive analytics, a facet of machine learning, could be used to anticipate guest preferences, thereby enhancing personalization and customer service. However, the adoption of these technologies necessitates a careful balance. While it can optimize efficiency and improve customer experience, it may potentially infringe upon guest privacy. Therefore, hotels need to judiciously implement these technologies while ensuring transparency and data protection.

Next, we explore the concept of sustainability, an emerging trend that is increasingly permeating the luxury hospitality sector. As the world grapples with the pressing issue of climate change, the industry is under pressure to demonstrate its commitment to environmental stewardship. In the context of Greece, a country rich in biodiversity and natural resources, this issue gains even more importance. Luxury hotels in Greece are expected to adopt more eco-friendly practices such as waste management, energy efficiency, and water conservation. However, sustainability is not just about the environment; it encompasses social and economic aspects as well. Therefore, hotels will need to engage in ethical sourcing, fair trade, and community development initiatives.

From a socio-economic perspective, demographics present another significant trend. The future of luxury hotels in Greece will be influenced by the changing demographic landscape of its clientele. The rise of the millennial traveler, who values experiences over material possessions, presents both a challenge and opportunity for luxury hotels. To cater to this demographic, hotels need to offer unique and authentic experiences that are deeply embedded in the local culture. This shift towards experiential luxury may require a redefinition of 'luxury', moving away from traditional notions of opulence towards a more nuanced understanding of the term.

Finally, let us turn our attention to another notable trend - wellness tourism. A burgeoning sector globally, wellness tourism is predicted to have a significant impact on the future of luxury hotels in Greece. In the face of a fast-paced and stressful modern lifestyle, more and more travelers are seeking solace in wellness retreats. Recognizing this, luxury hotels will need to enhance their wellness offerings - spas, yoga retreats, meditation centers, and healthy food options, amongst others.

These emergent trends, underpinned by technological advancements, environmental consciousness, changing demographics, and wellness tourism, are poised to reshape the future of luxury hotels in Greece. However, it is essential to note that these are merely predictions, and the actual trajectory may vary based on a range of factors, including geopolitical situations, economic conditions, and unforeseen global events such as the COVID-19 pandemic. As the industry navigates these complexities, it will need to exhibit agility, foresight, and innovation to stay relevant and competitive.

In conclusion, the future of luxury hotels in Greece is an exciting landscape, rich in opportunities and challenges. As they chart their course through this landscape, luxury hotels will need to balance the relentless pursuit of excellence with a deep sense of responsibility towards their environment and society. They will need to embrace change and innovation while staying true to their unique Greek heritage. This delicate balance, if achieved, will ensure that they not only survive but thrive in the dynamic and competitive world of luxury hospitality.