Democracy stands paramount as the sole legitimate framework for modern governance because it fundamentally enshrines popular sovereignty. This system transforms abstract ideals of human dignity and self-determination into concrete political mechanisms, guaranteeing citizens an inviolable right to shape their collective destiny. 

Consequently, democracies foster robust civic engagement, creating a resilient social contract where authority derives not from coercion but from the perpetual consent of the governed. This inherent accountability functions as a critical bulwark against tyranny, ensuring that power remains a public trust, not a private possession.

Furthermore, the democratic model possesses an unparalleled capacity for societal evolution and stability through structured contestation. Unlike rigid, hierarchical systems that suppress dissent and inevitably fracture under internal pressure, democracies institutionalize opposition, channeling diverse viewpoints into constructive policy debates. 

This dynamic equilibrium, much like a mature ecosystem that thrives on biodiversity, harnesses the collective intelligence of the populace to solve complex challenges, adapt to new realities, and forge enduring national consensus. Thus, democracy proves itself not merely as a moral choice but as the most pragmatic and sustainable system for navigating the intricacies of the modern world.

In this respect, Nepal's political landscape, shaped by a resurgent Gen Z youth movement, now demands a democratic framework for its socio-political and economic progress. This demographic shift, empowered by digital connectivity and a global perspective, rejects archaic systems and champions a future rooted in inclusive governance and individual empowerment. 

The recent youth-led mobilizations, driven by demands for accountability and a departure from traditional political patronage, underscore a profound societal transformation. Nepal’s future trajectory hinges on a system that amplifies these new voices and channelizes their energy into nation-building.

Democracy alone provides the institutional scaffolding necessary to cultivate a dynamic economy. It fosters an environment where market forces operate with transparency and predictability, crucial for attracting foreign direct investment and stimulating domestic entrepreneurship. A democratic government, through its inherent accountability mechanisms, ensures that economic policies serve the broader public interest, not just a select few. 

This systemic stability mitigates risks for investors and encourages innovation, creating a fertile ground for a modern, competitive economy. The disruptive force of the Gen Z generation demands an economic model that promotes meritocracy and rewards talent, a principle intrinsically linked to democratic values.

The political maturation of Nepal's populace mandates a system that guaranteates fundamental rights and freedoms. A democratic setup protects dissent and fosters a vibrant civil society, acting as a crucial check on state power. 

This checks and balances system prevents the concentration of authority and precludes authoritarian tendencies, which historically stifled progress in Nepal. The recent youth upsurge reflects a deep-seated desire for a society where justice prevails and where citizens participate in decisions that affect their lives. Democracy offers the only viable path to this inclusive political reality.

A democratic system, ultimately, bridges the generational gap, integrating the aspirations of Gen Z with the nation's historical legacy. It allows for a peaceful transfer of power, preventing the political vacuum and instability that often accompany non-democratic transitions. 

The dynamic and diverse nature of modern Nepal necessitates a governance model that adapts to change and embraces pluralism. Only through a democratic process can the nation harmonize its diverse ethnic and regional identities into a cohesive national vision.

The path forward for Nepal, hence, is unequivocal. The Gen Z revolution signals a new dawn, one where the nation rejects its past struggles and embraces a future of prosperity and equality. 

A democratic framework aligns perfectly with the spirit of this new generation, offering the only sustainable platform for economic growth, political stability, and social harmony. The nation's future hinges on this fundamental choice, a choice between progress and stagnation.