is challeger smite ever going to have it's on hit True damage?

But... It does give on-hit true damage. It's a DOT now.

I think even without WW abusing it, the combination of Devourer enchant with Challenging smite is just too strong for anyone that likes to build Attack Speed. The DoT makes it more evenly useful against anyone who wants to duel, rather than it being only any good on AS builders. The enchantments should be unique to stat-builds while the smite-alterations should be usable by any champion depending on how you play them (e.g. a ganking jungler could still take Ranger's and just farm a lot, may not be as efficient but it's the best option if you're not going to gank. A tanky jungler would never take challenging smite if it was on-hit damage).