you can't use the term "easier" for something that is not possible.
reversing a hash is simply impossible and will always be impossible until the end of time. no matter how much computing power is invented in the future because of how hash functions work.
I wouldn't count on that.
About 90 years ago Kurt Gödel found out, that one cannot make such "impossible" statements.
It turned out, that there are infinite number of not-yet-known facts about the natural numbers, which are not achievable by any finite set of theorems.
So, it's quite probable, that there's a theorem, which makes ECDLP, or reversing sha256 really easy.
If we deal with n-bit numbers:
For ECDLP I would guess a lower bound of O(n
c), c being a constant.
SHA256, or any hash function, should be at most O(2
n/2), possibly with O(2
n/2) memory as well. With some kind of probabilistic method, it might be even lower.
On the bright side, eventually this would be found by someone. Anyone smart enough to achieve this, would be smart enough to keep it for himself.
ECDLP solved means easy access to any coin with know pubkey(s). I doubt that early bitcoins would be touched though, it's too obvious.
SHA256 "solved" means cheap mining, leaving ASIC farms in the dust. One could easily mine 300 coins/day without being noticed, no need to announce anything to the big world.