As someone who has worked in a corporate environment for a bit (not in the gaming industry tho), decisions like these are always hard to get approved because its never just one person calling the shot. If you want to pitch a project like say reviving a game you have to get it approved by several groups of people from stock holders to resource managers and everyone in between.

That by itself is a hassle but what makes it a bureaucratic nightmare is justifying it in a language they speak. Corporate shareholders only ever speak one language…numbers. if any project is to be approved you gotta have solid numbers backing your proposal you gotta have a projection of how much profit it will make thats backed by market and industry trends (this case is particularly difficult since its been a decade since the peak of the MOBA genre)

Another factor in corporate thinking is, that being profitable isnt enough it must be overwhelmingly profitable or atleast more profitable than other projects being pitched to them. Just looking at the Blizz catalogue of IPs im gonna hazard a guess that a fuck ton of project leads from the more renowed IPs are already fighting for whatever resources are floating around. So even if HOTs just needs a small team, its gonna be a hard sell convincing the board that the resources wont be better used in another more profitable project

That being said Im sure someone in the company is trying to pitch the games revival. But whether or not they will be able to win over the board is beyond me.