
Temperans |
Wish mimics a spell of up to 8th level without issue, or a 9th level spell with issues.
If you wish for a spell to be dispelled wish could replicate any number of spells including spellbane itself (although it might have issues when doing that).
Wish says that it "copies a spell" similar to the various "shadow X" illusion spells. So I don't think wish itself gets countered. However I can see spellbane negating the copied spell effect within the given area.

Pizza Lord |
This is an interesting conundrum. I am inclined to say that spellbane (versus dispel magic) won't stop wish at face-value. It might depend on the wish's wording.
Being immune to dispel magic doesn't make spells in spellbane's area immune to dispelling. They'd still be subject to greater dispel magic or break enchantment or any other spell that could dispel them, like haste and slow's interaction.
Unless the wording for the wish was very clearly to duplicate the dispel magic spell, I think it would work (or have a chance to work). Whereas if spellbane was set to exclude wish spells, it would prevent them from working even if they were specifically duplicating a specific spell (like dispel magic).
Similarly, a spellbane that prevented flesh to stone and baleful polymorph would not prevent a polymorph any object from duplicating those effects or spells.

drsparnum |
I want the answer to be that spellbane would block wish. But I think the answer is that wish could defeat spellbane under these circumstances.
So now with spellbane you need to put up these to really not get dispelled:
Dispel Magic
Greater Dispel Magic
Source Severance
Wish
Any others?

Ryze Kuja |

In order for Spellbane to stop a Wish spell that is duplicating a Dispel Magic, then you would need to select Wish for your Spellbane.
So if you select Dispel Magic, it would not counter a Wish that is duplicating a Dispel Magic, for the same reason that selecting Dispel Magic for your Spellbane doesn't counter Greater Dispel Magic.

bbangerter |

Note that you don't even have to use wish to specifically emulate another spell. Wish can easily create an effect that is within the power range of the various spell levels while not exactly duplicating those spells.
...Produce any effect whose power level is in line with the above effects.
So IMO, spellbane wish is your only option to prevent a wish spell.