Pretty expensive though eh!

If you are looking to stream uncompressed Blu ray you might be looking at up to 40 to 50 Mbps.

In my experience this would be pushing it with the 200 Mbps powerline adapters which I have found to have throughput around 30 to 40 Mbps.
Haven't tried the new Gbps standard though which may be better.

If you are streaming compressed MKV's though you should be fine as you can lower the bit rate accordingly.