If the future is a mix between the two, I would prefer starting from Go and adding ideas from Java, than the other way around. Go feels lighter, simpler, more pleasant to work with. But Java has had a lot of good ideas added over time that would be nice to see in Go.

I sometimes like to compare programming languages to vehicles. Java is perhaps the long haul truck and Go the smaller and more agile delivery van. The smaller van is more approriate for the things I work with for my own pleasure, but the truck has its places for the bigger enterprise jobs.