We really need to ban the word "everyone," since almost nobody seems to be capable of using it correctly.
The event should be *exactly* as hard as JKR was; they don't design these events one way for the first run, then change them for repeats, the way they start is the way they always will be. There is literally no reason for people in the future to have a harder time getting DR than they do JKR. They are the dark and light sides of the same coin.
Will there be more first time DR unlocks than there were first time JKR unlocks? Almost certainly. But not anywhere close to as many *total* JKRs as we have after two runs.
All that would be accomplished by raising the gear requirement is getting some people, most of whom have probably already spent money, to spend even more money. It's not going to shrink the number of unlocks in any significant way, because people who already put in the money and/or effort to get these characters to 7 stars aren't going to just shrug and quit because they need to spend a little more on gear.