I don't think there is anyone left in the hots team outside from server technicians to keep it going.
Getting new devs who have all never worked on this game to give it more development... i doubt it honestly.
It would be quite expensive for probably no return. Hots is on life support and it will stay that way. The tried to establish themselves as a casual MOBA but never managed to get a significant foothold in.
Reviving an allready failed game never works.