the new threat...is?

What do yall think the new enemy is. The flood was eradicated so what now?

I had a thought the other day that what if before the halos fired [past or present firings], a group of flood was sent to another galaxy and now there are multiple graveminds in that and maybe other galaxies. And/or there are other arrays in those galaxies for that very reason.

I was reading one of the books [343’s editions] and at the end a reporter was thinking about Cortana’s message. She said there was another way to stop the flood but she didn’t know about the replacement I think. So what was that other thing…

Could be the Forerunners vs. Precursors and covies will be with precursors and UNSC and BADASS ELITES with Forerunners