Would be good for America if both pulled out because a younger candidate with fresher ideas would be better for both parties IMO. Sadly can’t see it happening but a good choice for Democrat would be Gavin Newsom, great debater full of good ideas and would certainly galvanize the country if elected. For the GOP, well not sure but there must be plenty of young contenders, maybe Nikki Haley who would deal in actual policy when speaking to the American public and not just conspiracy theories.