Here's a better solution.
Restore the dungeons to the way they were before the Revamp then add a Hard mode altar room to all dungeons for people who want to can slog their way through these insane dungeons that don't really justify the slog fest that they are.
These dungeons are chasing new players away!!!!!!!
I'm a new player, and these dungeons certainly didn't chase me away. I mean, sure, you end up running Albey and Ciar for your first several hundred levels since they're the only ones you can handle without being eaten alive by the mobs, but it gives you something to work toward. I was super happy when my main was finally strong enough to solo Math normal, it was a huge milestone...even more so than when I was able to finally beat the heavy and light gargoyles in the G1 green gem dungeon. It showed how far I'd come since I started and how much my character had grown. I wouldn't want the dungeons nerfed, even if it would make questing for Blaze, Ice Spear, Fireball, and Thunder slightly easier. It makes beating the next strongest dungeon for the first time that much more thrilling, and finishing those skill quests that end with "Finish X Dungeon" or require you to obtain an item that only drops from an enemy in a tough dungeon that much more satisfying to complete solo (though, I admit, I bought that one Thunder book page that you need to get from a boss from a dungeon I'm not tough enough for yet from someone else, but I did earn the gold I used to buy it). Maybe it's just because I'm an old lady who grew up with older, harder games like the Genesis "Sonic" games, Streets of Rage, Phantasy Star II, Final Fantasy VII, and such, but the current difficulty level of the dungeons is just right to me.