While there are tones of guardians to fight already, they can become very repetitive after a certain amount of time, the new guardian added is very welcomed but heres a pretty good idea. The guardians are mostly alternative versions of the campaigns 'smaller' bosses or upgraded normal enemies, wouldn't it be cool if they included the games bigger bosses, like belial, azmodan, malthael. seigebreaker and others as alternative guardians, and instead of fighting in the rift area a portal opens to their respective battlegrounds. I see this as a quick easy way to add more to the game, and would love to see it implemented by blizzard!
Feel free to leave comments, additions or even what kind of new attacks these bosses could bring in the rifts.