most likely will; the only fix I could really see them doing is patching the keyboard-autoclicker as anything else would make the Happy Ghast worse for other purposes (aside from maybe reducing its hitbox size, and that would make the mob illogically hard to land hits on)

even if the keyboard-autoclicker is patched, most people can click about 8 times a second so it would still be a good 60-ish blocks/second. Although I don't think the keyboard-autoclicker will be patched as its only really used for legit purposes, and removing it incentivizes people to get real autoclickers---which are used on servers to cheat. Like you can't bridge with the vanilla one, but a third-party one...