He doesn't need to worry about replacing his FS just yet, they're still running iptv fine so maybe he could use the time to save up a bit more for a better device.
Current FS users who are looking for something comparable in the same price range are probably going to be disappointed, I think Amazon sell FS at a loss because of the money they make through the streaming services on them.
It might be worth pointing out to him that if/when the FS OS does change he'll still be able to watch Netflix, Disney+ etc on it even if they do block sideloading of third party apps so if he's got a spare HDMI socket on his TV it could be best he buys an iptv box/stick in his budget and keeps the FS too.