If it's not neurons, it may be that the foundation for understanding consciousness is wrong. Which would be assuming that some objective, abstracted view of the world can explain our subjective experiences.
I'm not saying it's impossible. Who knows. But it remains a hard problem for now, at least.
If falling isn't the result of gravity, then that would be a good reason to suspect that physics is somehow false.
If it's not neurons, you're going to need extraordinary evidence!