There isn't a specific technology that would make Reddit obsolete, but there are a few trends that could contribute to its decline. First, social media platforms are increasingly becoming more visual and focused on video content (e.g. Snapchat, Instagram, YouTube, etc.), which could make Reddit less appealing to users. Second, there is a trend towards more generalized social media platforms that allow for a wider range of content and interactions (e.g. Facebook, Twitter), which could also lead users away from Reddit. Finally, there is a trend towards private, messaging-based social media platforms (e.g. WhatsApp, WeChat), which could provide a more intimate and personal experience for users than Reddit.