Quickly as possible? Blizzard is already juggling the E-Sport scene with StarCraft, World of Warcraft, and upcoming Diablo, not to mention the Titan proejct. Yeah Blizzard is ambitious but they are aware of their capabilities (AKA StarCraft: Ghost).
If Blizzard is ever going to capitalize on DotA it will be in the future where Valve already releases Dota 2.
Using SC:G as a reason they wouldn't make DOTA another pillar is kind of short sighted
1. SC:G they didn't know what they wanted to do with the game in terms of mechanics, gameplay and story
2. They kept changing their minds about elements
3. They finally cancelled it.
DOTA is all but done, its not like they'd have much work to do on it. Commercializing it would be easy for them. The heavy work has already been done.
DOTA would make much dinero from the get go, it already has a rabid community.
If Blizzard was really about the community here, then their main argument should be "we want this to be a public domain mark" instead of we use this, it's ours! That they're currently shiling.
Right now as it stands, Blizzard isn't anymore holier than Valve when it comes to DOTA and the marks.
You can't use the argument that Blizzard is doing this for the community because they let it exist for 7+ years. Because one could EASILY counter with.....Blizzard didn't see the financial stake in DOTA until another company showed them there was one.
Its like saying BP let these people stay on the land for 7 years, they're only going to court with Exxon so that Exxon doesn't take that huge oil reserve below it. BP wants to keep the land for the people.... (shitty analogy but you get the point).