We don't currently have any plans to remove any of the global ults in the game and in fact have a couple more in testing that are showing a lot of promise right now (at least one of which I expect you'll see in game at some point).
When global ults have been problematic in the past (Panth/TF years ago for example) it's been because they've been free targeted movement abilities. Shen's ult by contrast shifts him to an ally's location, not any spot of his choosing, and that restriction avoids a lot of problems (forcing uneven fights at positioning of your choosing without risk of interuption, telegraph moving to get in range etc). GP's ult is free targeted, but doesn't move him, so doesn't create the same problem cases.