I think I'd like that, yes. For me at least, the attack roll is quite enough for the thrill of rolling, no need to throw a bunch of die after that.
On the other hand, I'd would prefer that spells had a random number of targets in a range, like 13th Age does.
Ex:
Fireball
Ranged spell; Daily (in 5e, range 120 ft, 3rd level spells etc)
Special: When you cast this spell, you can choose to cast it recklessly.
Target: 1d3
nearby enemies in a group. If you cast recklessly, you can target 1d3 additional enemies, but then your allies engaged with the target may also take damage. (in 5e, the ally within 5 ft of targeted enemies would need to make the save also)
Attack: Intelligence + Level vs.
PD (in 5e, it would be Dex save vs Spell DC for half).
Hit: 8d6 fire damage. (30 (?) fire damage, if you take fixed average damage).