There was a time Yato wouldn't hesitate, but at this time he did. He was desperate, cut off from everyone and he needed human cooperation to continue to exist. Everything he'd done up until that point recently would've meant nothing if he slid back.

"I would probably reject their wish."

Greater gods could afford to do that, he couldn't, but at the same time he didn't think Yukine would forgive him if he accepted those wishes again.