There are really a limited number of reasons. The first and last are relevant to operators, the others to end-users.
- Opex. FTTH brings large savings to operators.
- Speed, bandwidth. FTTH can handle speeds of 1 or more Gb/s.
- Downloading. It can never go too fast. And uploading is generally slow on any other infrastructure. The asymmetric nature of traffic has nothing to do with this argument.
- Redundancy, reliability, dedicated & future-proof access.
- Only on FTTH are real-world speeds comparable to headline speeds.
- Screens are getting bigger.
- Growing video traffic.
- Quality is getting better (HD, UHD, etc.)
- Web pages are becoming heavier, with more graphics, auto-play video etc.
- There will be more devices, more users.
- New applications.
- Backhaul for (offloaded) traffic, including tethering, mobile hotspots.
- Multi-tasking, including app updates, software updates, photo/video uploading etc.
- Latency. FTTH beats other technologies. This is especially important for critical (but low-bandwidth!) IoT services.
- Marketing. No matter what, speed sells.
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