I'd say it will morph, and elements will remain in the republican party but not intact.
Trump is a huge magnetising force but without him, it doesn't really have anyone else. Sure people like Vance will try to further their own ambition but none of them will succeed in taking on the mantle and keeping it as the force is today.
I don't think anyone in 2014, let alone 2013, predicted Trump would be the leader of the Republican party in 2016. It seems a little early to make the call that nobody will fill the vacuum between now and 2028.
I'd say it will morph, and elements will remain in the republican party but not intact.
Trump is a huge magnetising force but without him, it doesn't really have anyone else. Sure people like Vance will try to further their own ambition but none of them will succeed in taking on the mantle and keeping it as the force is today.