WiFi
WiFi, standardised in 1997, has demonstrated remarkable staying power for a technology. It has survived multiple protocol upgrades, weathered competition from mobile data, and continuously evolved from 802.11b through to WiFi 7. The fundamental concept of wireless local networking shows no signs of obsolescence, with smart home proliferation guaranteeing relevance for decades to come.
However, technology evolution is merciless. Future developments in quantum communication or neural interfaces could potentially render electromagnetic data transmission quaint.