How do you know it will be "tens of millions" from Sony? Because I think that's highly unlikely.
Partly this...
I fail to see how the support of 30k backers make a big difference in the decision of doing or not doing a game. It's not "hey, we'd like to throw 20 million in a game, let's see whether it'll be a success by asking to a couple ten thousands fans if they'll buy it".
I can see a publisher investing as much (or twice as much) the money gathered by the kickstarter for a game (like the recent Igavania, and that still remain to be seen whether they'll really invest 5-6 millions), but not tens of millions.
Either (A) it's a test to see whether there's demand, and they'll throw several millions (but not tens of millions).
Or (B) the kickstarter is just clever marketing (and not interest check) and their intent has always been to invest tens of millions no matter what, because the kickstarter can't tell them much about the outcome of the project.
I can understand the first situation, but not too fond of the second strategy (and to people saying Shenmue III wouldn't exist without the kickstarter, I don't think it's obvious if it's the (B) case here... but at the same time, I'm leaning towards (A) ).