More food for thought. While I agree these terms out a bit outdated they're still familiar**. I see .online, I think American Online, or I'm sure people realize they're online when they're on the internet.
Marketing dollars. Most of the niche extensions, not even worth it. .kitchen, why spend marketing dollars when you can't expect to get a good return on something that might only ever get a few thousand regs. So the more general ones have a better chance.
Somebody searches for .com not available, these registrars are going to push the hell out of .web. So not only the registry, but registrars. Maybe GD gets a SB commercial for them. They're going to put the marketing dollars behind the ones that have the best chance. The most watched generally has the best chance.
I see .web as just an extension. Some see it as internet. Some see it short for website. Multi-use.
**back to familar. Google Exact Match, Worldwide
web - 7,480,000 - people know this term, more than the next 4 terms combined
net - 5,000,000
online - 1,220,000
gdn - 60,500
xyz - 110,000