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Wikipedia has a tendency to string adjectives together to form a description of something, usually after long and bitter debate on the talk pages.
What this sentence means is:
conservative Protestant theology: this isn't a well-defined movement, but refers to the theology of non-Catholics who mostly hold to traditional Christian views. The adjective "modern" simply means those people who hold these views in recent times.
minority opinion: most conservative Protestant believers don't hold to Annihilationism.
legitimate minority opinion: holding to Annihilationism won't get you thrown out of the "conservative Protestant" group (ill-defined as that is)