I agree.  The Congress derives its enumerated authority from Article 1, Section 8 and the President derives his enumerated authority from Article II, Section 2.  Neither derives their authority from the preamble; this proves my point.  Nowhere in Article I, Section 8 or Article II, Section 2 is the Congress or President authorized to institute a national or universal health care plan.  Consequently, any such program would require a constitutional amendment under Article V.