Nintendo have done a great job on the whole 3ds security, this why I think the 3ds will never be hacked.
Yeah.. Remember when Sony was going on about how great their security for the PS3 was, and it ended up to be a total fail? Everything is hackable, it's just a matter of time.
It's blatantly obvious that the encryption keys for newer firmware versions of the PS3 have been obtained, but the methods and the keys aren't being leaked for obvious reasons.. If you don't know, it's because Sony is sue happy, and a lot of people just don't want to bother with the financial issues that will be brought upon them from being sued.
If you really want the honest truth, from a software standpoint, the 360 is a hell of a lot more secure than the PS3; and no, the firmware flashing for the DVD drive doesn't count as it only allows you to play burnt discs, and not boot unsigned code. Although, the SMC hack that's known as JTAG for the 360 is more of a software hack than anything, but it only works on some seriously old versions of the 360 kernel. RGH is the reset glitch hack, and basically, it resets the CPU causing it to run in a glitched state that allows unsigned code to be booted, so RGH is more of a hardware oriented exploit.
The 3DS will be hacked, it's hacking scene is in it's infancy though, and there's only a few people who are seriously working on it and doing the research that will serve as the groundwork for further developments for the console in the future. The "better" the security on a device is, the more people it'll eventually attract to hack it, because it'll serve as a good challenge and a great learning experience. You obviously lack any knowledge of the time and research that goes into hacking a console, so keep your mouth shut about topics that you're ignorant about.