In 5 years, it can become stable than now, i think in one condition if it would be regulated. For my opinion, for somehow Bitcoin must be regulated. Hiwever, the total centralization would kill all key features for what we value cryptocurrency. So I think after 5 years we find the way how to regulated it, but keep its features as well. Otherwise, it remain unstable, And it is popularity would grow slowly as well as an investment in it but not mainstream fastly.
there is no way that we can ever have it all. utopian plans degrade quickly. if you make something that is untraceable, the people demand you find a way to trace it. put too many controls on a thing and people demand more liberty. i would like to see bitcoin stay exactly as it is and let the government regulate newer coins. bitcoin is more than a virtual, decentralized commodity marker, it is a work of coding that set out to be a certain thing and became exactly what its goals were. satoshi set out to prove a security rule set, to solve an ancient riddle from his ancestors and he did that. he never intended bitcoin to go this far, although i am sure he is happy it has. if someone wants a "Mona Lisa" that smiles more, paint a new picture and leave the original.