Vaxneuvance is already FDA-approved for adults (#msg-164961310), but I don’t think Vaxneuvance will compete effectively with PFE’s Prevnar-20, which has broader coverage of pneumococcal serotypes and a simpler (one-shot) treatment course (#msg-166441188).
p.s. MRK pays PFE a royalty of 7.25% on worldwide Vaxneuvance sales during 2022-2026 and a 2.5% royalty during 2027-2035 (#msg-166075692).