>we still don't have a modern filesystem (it is true that Windows and Mac don't, either)
Windows now has ReFS, which at first appearances looks pretty good - though it also has a rather 1.0 feel to it, as you might expect. I've not used it myself though as it's only available in Server 2012 (and IIRC Windows 8 can be persuaded to use it, but it's not supported; I may be mistaken there)
To be honest, ZFS isn't exactly a magic bullet either; it's an 'enterprise' filesystem, in both the good and bad senses of the word. Although I do think ZFS is probably the best filesystem currently available, it feels like it was never quite finished and has a very uncertain future.
I was following Tux3 with interest the first time it came around, and only just discovered thanks to this article that the restarted efforts are now on a different mailing list; the website still points to the old one that hasn't had anything posted in ages.
 Perhaps that's a little unfair; if I were feeling more generous I might s/finished/polished/. Most notably there are a number of things you might expect to be able to do that require you to destroy your pool and restore the data from backup, which for most people outside of the enterprise environment is likely to be a time-consuming and stressful experience with a lot of downtime.