Peter W from Lumin posted on the AudioShark forum that there will not be an upgrade to the X1 in the foreseeable future. He said they have nothing better than the X1. They will continue to do firmware updates to the unit.
I know there are lots of other avenues to pursue same objective, but I'm unconvinced that they are superior to the simplicity of a direct fiber path.
I learned this the hard way with my EtherRegen in front of the X1. The X1 streaming was stopping periodically for a while. Then it started stopping regularly. I called up Uptone Audio (makers of eR) and we discussed this problem. The guy there said that eR and ROON and X1 sometimes have issues like I was having.
Long story short, I realized going direct from switch was simpler (maybe not the ultimate best sound). After, I took out the eR for a few days I wanted to see if putting it back in would work. Well, it did without problems (yet). However, the first drop in streaming I get I am removing the eR from the X1 and ROON. I will move the eR to the OpticalRendu, which has no issue with the eR and ROON.
KISS is also what I am going to do with streaming.