The 2-2.5x increase in needed scrolls is surely a problem. It was already a problem before the spell rework due to needing them both for spells and minions, but now it has become so that it does feel easier to evolve spells to legendary and even mythic than just to epic +.
The ability to craft lower rarity runes/scrolls with higher rarity ones sounds nice, it isn’t free value since you still need to get the higher rarity resources but still helps and more importantly it will make us feel better when we get legendary or mythic runes/scrolls in chests or rewards. There is something clearly wrong when getting a mythic rune or scroll in KD rewards feels even worse than getting just shards, or by getting depressed after opening a chest full of just rare/epic relics and legendary/mythic runes/scrolls.
It is nice to know that this is also being addressed, because the more pages we get without being able to evolve spells, the worse it feels. So as time passes this will become more and more frustrating.