1805, I don't think any of those nations choices vindicates your view of rationalising the our fleet down to just 3 ships.
Spain: The Juan Carlos is replacing the Principe De Asturias and will operate mostly as a Harrier carrier until the AV8B fleet runs out, Spain may then opt for F35B, but no guarantee. interestingly Spain also sees the need for LSD's, with the two Galicia class doing most of the amphibious leg work, much the same as the RN. The Spanish way is a good solution to their needs, but they clearly did not identify a 100 sortie a day surge requirement (based on experience of the Balkans, GW1, Falklands etc) We are not Spain, spain is not the UK.
Edit, The intention was for JC to complement PDA, however the PDA may now enter a period of extended readiness possibly to be refitted if the money is found.
Australia: The Australians haven't operated carriers since the 1970's, unless they do opt for F35B down the line, the Canberra's will not be operated as fixed wing carriers. Australia needs the Canberra's due to the requirements of its own geographical situation and foreign policy goals. They have also bought a Bay as a utility vessel so see an economic case for both types.
France, I like the Mistrals but the french have the CdG as the carrier, Mistrals are not carrier replacements, France did not or has not seen the need to combine the two roles and the French are quite an innovative bunch.
Russia. Kuznetsov is the carrier, Mistral as amphibs, possibly used to intimidate neighbours.
The JC's, Mistrals and the BAe design are excellent ships, no one would argue with that, but they do not in any way provide a better option than a proper carrier, if as a country we want to project serious air power. There is no need, the budget savings are arguable and we have perfectly good vessels already paid for and in service.