You need to provide some context. Of course if you go out into dark space for months at a time, you're not likely to get ganked, nor see other players.
I don't share your experience at all. I was ganked within 5 minutes of my first time in open when I thought it would be a good idea to play with others at a community goal.
To be fair, I think it probably IS fair to say "gankers didn't kill Open".
I'd suggest that if anything
has "killed Open" it's simply a lack of incentive to play there.
OTOH, I'd also agree that it's incorrect to understate the threat from gankers.
It's not easy to form a properly balanced opinion these days, due to the overall lack of players
in Open, but at it's peak popularity I'd see at least a couple of dozen CMDRs in each session and I'd get attacked at least once every session.
If I was in, say, Deciat, Robigo, Shin Dez, at mining system or at a CG it could happen every 5 minutes!
Trouble is, these days, is
seems (to me, at least) like players have either migrated to PGs or they simply don't care about the non-pew-pew interactions they might have in Open so they opt for Solo.
That being the case, it's more likely players you DO encounter
are looking for pew-pew if you choose to fly in Open.
Course, the flip-side of
that is that, due to the overall reduced number of players in Open, you're much less likely to encounter any players at all.