You realize if you are successful you could brute force ANY BTC wallet whether you had legitimate claim to it or not.
In other words, bitcoin would be essentially dead, since you could take from any arbitrary wallet. You would start with the biggest ones, of course, and eventually word would get out, and bitcoin would be officially dead.
So far, since the 2009 release of the bitcoin protocol, nobody has hacked an arbitrary wallet. This is presumably not for lack of trying.
I would, to quote Justin Bieber, "Never say never," but if you want a way to open a wallet, you might be brute forcing for a long, long time.
Not quite, I'm trying to crack a wallet with a password I created that is over 14 characters long. Since I created it though I have a base password which I know for certain is in the password which brings down the length of the password I need to crack to an insecure length. It is already pretty much known you don't use passwords less than 8 characters, preferably 14 or greater.
All of this got me thinking, wouldn't it be crazy if after all the bitcoins were handed out the infrastructure once used to mine was turned to hack wallets because of their value.