Science says that anything living near the earth's core will be plasma based (another way of saying we wouldn't know it if it bit us). Anything living in the Earth's crust will be microbial due to the intense 'pressure and heat' generated by the depths involved. You have to understand that your question makes no real sense. The Earth's Crust is nowhere near the Earth's core since it is so thin (think of an orange sliced in two pieces with the rind being the earth's crust).
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No
it is speculation based on wishful thinking
it is speculation based on wishful thinking
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It's speculation backed by ignorance