You might want to have a look at this
article. This is an interesting article by an Australian ISP who have made an experiment with BTRFS, just to see how things are coming along.
It looks like BTRFS is really good for multi-volume RAID configurations, and really big file systems.
Well, yes there are certainly some advantages to this kind of approach (the combined 'LVM + filesystem' part, which you could also describe as 'ZFS-like', if you wanted) for 'big data'. On the other hand, 'big data' applications tend to be more unforgiving of data snafus, and so newly developed filesystem may well have difficulty getting adopted in this area, due to the difficulty achieving the required 'tried 'n tested' status without adventurous early adopters driving the project forward (Would you, eg, take much confidence from the idea that your hosting provider had decided to keep your data safe by keeping all on a freshly minted filesystem? Many people wouldn't.)
The 'snapshotting' part seems potentially useful to many users, whether they be desktop users or 'big data' users, even if the non-geeky probably won't see the advantage until it is made directly apparent to them.
Potentially, BTRFS could have advantages in different areas, from big to small, but the advantages that different users want from it are probably different, so the testing issue, and demonstrating the practical reliability, will probably take a bit of time.