Why put in a higher speed WAN link?
To be able to search your cloud file storage for a file with some specific contents in it.
To work from home where large files are accessed often.
To backup your computers to the cloud, or restore a block of files; without taking forever.
Improved latency.
Multiple things running at the same time without saturating the link.
You also get a faster upload speed.
Running interactive apps that benefit from having faster speeds.
So you can laugh at clueless naive people about why their slow links are great, and translating that great knowledge into why their golf carts that only go 1mph are also just fine for them.
Why put in higher speed wired links?
Reliability.
Lower cost.
Easy to do.
Performance.
Future proof the growth of technology.
Don't need to reboot wires often.
If a 20mbps WAN download speed works for someone, then that's great. It won't perform well for many others. Even the current standard definition for "high speed internet" is being raised from 25 to 100mbps.
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