Oh, absolutely. Keeping your keys safe is vital to reaching your assets. The point in cryptocurrency is that you are your own back, and with that comes absolute responsibility to safeguard your own bank and making sure you keep your access to it.
Depending on the ways you've set up your keys, passwords etc it may be possible to brute force. But if used with recommended settings and password lengths it would be a very long job depending on the power you can brute force it.
Thanks, I was worried for those poor bitshares being lonely! ;)
The problem with bruteforce cracking of keys is that they are so random no? You have to test if you have cracked it :D