You are a consultant for an urban planning firm examining post-pandemic residential trends. Prepare a report analyzing the long-term consequences of widespread remote work on the core functionality and economic model of major metropolitan centers. Offer a personal assessment on whether cities can successfully pivot from commercial hubs to lifestyle-centric communities, and formulate three pressing planning challenges (e.g., tax base collapse) for inter-departmental deliberation. The report should be titled: The Decentralization Dilemma: Remote Work's Impact on Urban Density and Infrastructure.