The biggest problem with Spiritborn Ultimate skills is the restriction to not be able to recast it on CD, and instead have to wait out the duration. In a game where speed and mobility are very important anything that just sits in place for and extended time becomes less and less useful as you progress. If you are standing in one spot for 6 seconds, gaining the full benefit of the protector, you probably are going to have trouble finishing a high level pit, undercity and not be very effective at Infernal Hordes.
With the new Spiritborn Unique gloves it looks like there is an attempt being made to make the Protector viable(I have been trying to make it work for some time). In my opinion The Protector needs either the ability reduce the duration or be able to recast it as soon as it comes off CD, this would be my preferred option and would require a lot of CDR to actually make a difference. My proposal is that recasting it would cancel the current iteration allowing you to move it more frequently, but having multiple Gorillas on the screen smashing things would also be awesome.