I forgot to add - I have a deep suspicion that Harrison Ford does not really care that much what happens to Indiana Jones without him. Anyone who has watched him in interviews has seen him put on this grumpy, I do not give a shit attitude. Those questions about recasting Indiana Jones were presented to him while promoting other movies. I imagine he was annoyed to answer a question that was a complete hypothetical he has little control of. He was the same way for years when asked about Star Wars until he was involved again. Than he was back onboard and a team player which including support of Alden Ehrenreich and Solo.