English proficiency - More people are learning English
Increasing traffic congestion in cities
At large tech companies people on the same campus now routinely do video calls instead of traveling 10 minutes each way to a different building.
More ways to enable remote-only work are continuously being developed. One example is the evolution of speech-to-text conversion software, which is more accurate and faster than typing, thus making written communication easier and more effective. Reading was already faster than listening, but now the process of committing speech to text + reading by recipient can be the faster way to communicate even in a 1:1 communication. For one-to-many communication, typing + reading is already faster.