Seeing that the author of Blade (kvark) isn't exactly a 3D API newbie and also worked on WebGPU I really wonder if a switch to wgpu will actually have the desired long term effect. A WebGPU implementation isn't exactly slim either, especially when all is needed is just a very small 3D API wrapper specialized for text rendering.
Kvark was leading the engineering effort for wgpu while he was at Mozilla.
But he was doing that on his work time and did so collaborating with other Mozilla engineers, whereas AFAIK blade has been more of a personal side project.
Cross API graphics abstractions are almost always a bad idea even if its just wrapping modern DX12 and Vulkan, and always always are when Metal comes into the mix.