It was also publicly stated (albeit maybe not so prominently) that it was being removed in JUCE 8.
I’m not fond of the GUI editor but I see it has some popularity so in that same topic I suggested the idea of asking the JUCE team to release the GUI editor in the public domain so that a communitiy effort may keep it alive/up to date if desired.
Someone interested in that may want to create a topic in “Feature Requests” to see how many people would be interested.