Why no chance? Eritrea is already in Northern Ethiopia at the invitation of Abiy’s government. They were the ones who saved him. It’s not impossible to believe that they will save him again. Western powers are already supporting TDF.
They're not actually supporting TPLF they're influencing Abiye to end the war and negotiate a settlement. A full fledged western support for TPLF (media, cash, arms, regional pro western allies) will be hard missed.