Mobile HTML5 Applications can save development time by allowing creation of apps for multiple platforms like Android, iOS, and Windows Mobile using a single codebase. However, HTML5 apps still cannot perfectly match the look and functionality of native apps, and have issues with performance, integration with other apps and devices, and varying support across browsers and devices. Hybrid apps that combine HTML5 and native platform features try to address these limitations but often lack the quality of fully native apps. While HTML5 will continue to improve, it still may not be a full replacement for native mobile app development in all cases.