Yeah although there is a possibility that Charizard might be Fire/Dragon someday, the chances of that alteration is very minimal because they say that would make Charizard very powerful for a starter, which is not fair for other starters. I don’t see how. The recent generations' starters are already more powerful than Charizard since they are not weak to friggin Stealth Rock. While I agree that being a Fire/Dragon would negate one of Charizard’s elemental weakness – water – but not being a part Flying type would also make it vulnerable to Earthquake, which is not bad but would balance out things well, no? It's interesting to note, however, that Charizard is the only fully evolved starter that learns the most Dragon type moves – Dragon Rage, Dragon Claw, Dragon Tail, Dragon Dance, Dragon Pulse, Dragon Rush, and Outrage. That's 7. Dragon types like Altaria and Flygon learn 6. Only Feraligtr comes second as a fully evolved starter to learn 3 dragon type moves.