I'm guessing that depends on how big the pile of Fuchsia-compatible device drivers grows and how badly people running open source OSes want to use that hardware.
Where there's a demand for a particular class of device, maybe someone will create a shim? Then the kernel folks can have a debate.
Currently though, I think Linux has a big head start.
> The Fuchsia kernel is released under the following MIT-style license: /zircon/kernel/LICENSE.
> All Fuchsia user space components are released under a BSD-style license: /LICENSE or an Apache 2.0 license: https://fuchsia.googlesource.com/infra/+/main/LICENSE.
> All code that is BSD-licensed has an additional IP grant: /PATENTS.
[1] https://fuchsia.dev/fuchsia-src/contribute/governance/policy...