I'd like to see Next move back towards the fireball being the answer to hordes, for sure - maybe with a larger blast radius. It does have the built-in option to spend a higher slot for more damage which is nice, but I'd rather see that for Lightning Bolt (which it does have) and give Fireball an option to increase the area. I don't really expect that to happen outside of some kind of magical feat but it would give a wizard some more options during play.
Have you played a Next wizard? Fireball works just dandy against hordes. Bigger AoEs are available with higher-level spells: Cone of cold targets a 60-foot cone, sunburst has a 50-foot radius, and meteor swarm creates four 40-foot-radius blasts. (Meteor swarm also has a listed range of 1 mile, in case you want to bombard the dungeon without ever leaving town.) Unfortunately, the playtest spell list is not all it could be, but it gives us an idea what's available.
Now, when the horde consists of giants or trolls or something... yeah, you won't be able to slaughter them all with one blasting spell, and I think that's as it should be. Not everything is easily zorched into oblivion; this is why mass hold monster was invented. But you can go well beyond low-level humanoid mooks. For instance, wights, wraiths, ogres, werewolves, and medusae are all within the average damage range of a single mid-level blast.
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