I do believe that they can get small slice of player base of the current Moba scene. League of Legends and Dota2 popularity around the world is still dominating, I would like to say, it's a bit late for them even few games Moba gamers are coming this year.
2014 Moba games:
LoL (Riot)
Dota2 (Valve)
Smite
Hots(blizzard)
Dawnsgate (EA)
Hon
Heroes of MiddleEarth (Moba type, Lord of the Rings)
A bit more info:
Icefrog, current Dota2 developer, during Dota1 era, he asked Blizzard if he could lead a team to create Dota as a seperate client but part of warcraft universe, but Blizzard just canned the idea because they think at that time, Moba scene is not the right direction of the future gamers.