Depends. If Macapagal loses, Marcos might stay with the Liberal Party, even though he is clearly a Nacionalista. Of course he will probably run and win in 1965 as per OTL. Anyways, wasn't Garcia to Magsaysay viewed as LBJ to JFK, namely a place-holder in the VP slot who lost a second term? Marcos will probably proceed as per OTL. This will butterfly the dynasty, if anyone here dislikes GMA. Which means more Estrada

or possibly Imelda in 1992

.