Google has two and I think a third Analytics integration is here or on the way shortly. Mojo only supports the older style universal analytics at the moment and for never versions we put it in the skin (such as Tag Manager).
I wonder if a simple open text box is better and the user just pastes in the code Google provides? This wouldn't be depreciated as fast. This same code block could be used for other services as well for analytics tracking. It would need a little thought as to how it's placed, maybe with different location options like the Custom Javascript module does.
Not sure, just bringing it up for discussion.