Personally, I think this will take time and effort to crack since there are hundreds of thousands of wallet owners in the world, but when this comes I'm sure we will have developed a precaution for this. And I'm pretty confident that we will have a secure future and bitcoin will have a big part with this.
Anything is possible, but i think that bitcoin is surviving, i think that so many people have attempt to do so, but still not succeeded, we can hope that in future it will become more powerful and secure, then it may not be possible to crack bitcoin, i think people already have trusted on bitcoin and that is the reason that they are putting more trust on bitcoin.