I have not noticed any announcements about UA removing Global First from their current Intl long-haul 3-class fleet....but maybe I am mistaken?
I don't see any evidence they will do so, I certainly don't see new fames coming with GF, but apparently, according to the "who pays for GF" thread, there are people who have sufficient disposable income that they are apparently happy to burn it on GF. I don't see UA spending/wasting money ripping them out and either ordering and squeezing in more IPTE seats, or the CO J ones.