Bluetooth approved a mesh standard just a few months ago. This would allow devices designed to use it to extend range in the same way other mesh networks like zwave and zigbee do, but with the same negatives of mesh.
This won’t help low cost generics or most existing end devices, but will probably affect home automation overall.
The other option is a bluetooth to WiFi bridge, such as Lockitron is offering for their new lock. That could be used with existing Bluetooth devices, but requires a bridge in every room.