I am delighted to see more opportunity to use Haiku programmes elsewhere as it enables newbies to ease themselves into Haiku from the comfort of their own OS. I am not convinced there is a massive pool of potential Haiku users in NetBSD waiting for an easy migration path, but I may be wrong. And presumably from there is would be easy to make it work for other UNIX derived systems like Macintosh and Linux.
Personally I am more interested in opportunities to migrate forward rather than back to 1970s UNIX paradigm 
Regular readers will have heard me banging on about it before but the compatibility layer for Genode enables our programmes to work on that microkernel powered, “capability based” piece of German software engineering.
Of course best of all is that Haiku has paths both forward and backwards. Being quite small, perhaps we are analogous to Switzerland, neutral territory that has to get on well and trade with all its neighbours?