It was asked pretty early on if Kit would reopen POs for Harry like other InArt figures and he unfortunately was very clear that Harry’s PO was closed for good. Maybe InArt realized that keeping POs open for too long prolonged their production time. When you’ve got ppl regularly and rightfully complaining about delays, it would make sense that they just decided to stop reopening POs for figures.
That said, I think it was either rumored or confirmed that InArt would be making the older versions down the line, so you won’t be out of the line completely unless you were dead set on getting the younger versions.
While you probably won’t get a GtG version, I would imagine that a GtW version could be possible should InArt want to opt in to continue LOTR figures with TT and ROTK.