Starting out with a much smaller ecosystem than already-popular alternatives is a totally normal part of the road to success. :)
One thing that works in favour of Zed, which previous IDEs didn't have, is that it's a lot easier to program things today, because of AI. It may even be possible to port many of the more popular extensions from VSCode to Zed with relatively low investment.
If the community goodwill can be maintained, and they can expand their extension system capabilities, the community will probably catch them up to the effective VSCode extension library size pretty quickly (at least for a 95% of user's needs cases). But I'm seeing a lot of indications they're headed toward enshitification before they even get fully off the ground. I'm just hoping they avoid the obvious pitfalls of prioritizing only profitable new features and flavors of the month when their only real path to success relies so much on tons of unpaid open source community contributions.
To date I know of barely anyone using it.
VSCode kind of had Atom’s audience to build off of, and other editors don’t always have that runway.