Sunfire Cape / Cinderhulk Scale with AP?

How troublesome would it be if Immolate, the damaging aura found on Sunfire Cape and Cinderhulk, had an AP ratio? I think it might be a bit of a boon to champions that have AP ratios and perform as bruisers, but have a hard time justifying buying AP. Would mages start picking up Sunfire Cape? Would champions like Amumu and Maokai deal too much damage? Would it be useless / a non-factor? I'm just looking at ideas for AP bruiser itemization and its sorta tough.
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