You should probably be looking at the core Laravel framework repository, not the "new project"-boilerplate.

https://github.com/laravel/framework/graphs/contributors

To me it seems like the ecosystem is growing rapidly. There are at least three large conferences each year, a handful of established podcasts and an excellent video tutorials site. There are also a number of paid services like Vapor for running Laravel on Lambda, Forge for easier server management and Laravel Shift for automatic version upgrades.

You're looking at the bootstrap install repo. That's barely changed since 5.0 was released in 2015-ish. The framework repo[1] is still being maintained by many different developers and sees a significant new release every 6 months. Taylor still accounts for a significant amount of contributions, but it is his project afterall. Also worth noting that the framework has pretty much reached maturity at this point and updates are more focused on stability and bug fixes than new features. A lot of the work being done is on the ecosystem being built around Laravel (see "The Laravel Ecosystem" on [2]), with Taylor currently teasing another new piece to the ecosystem to be released with Laravel 8 in a few weeks that apparently involves inertia.js (whose maintainer is a speaker at the Laracon event too, if I remember correctly)

1: https://github.com/laravel/framework/graphs/contributors

2: https://laravel.com/