They’re not going to go for Ingruber, because they’re going to want to hire an actor to play the lead role in their multi million dollar blockbuster.
I don’t think there’s any way the film is going to ‘work’, so it’s probably somewhat pointless to argue about. Casting Ingruber would be a massive, and potentially hilarious mistake. But I think the fact that people are rallying behind the idea just goes to show that when it comes to Han Solo, people want the character himself exactly as they know him, and not just stories about his life. The support for Ingruber is the support against the idea of making the film at all.
It seems to come mostly from people who think ‘oh god, this is horrible. I can’t believe they’re doing it. But if they have to, I guess they should use this lookalike’. Even if greenlighting this movie ends up being a mistake, Disney is making the right move by not catering to the people who think that ‘the thing is doomed to fail anyway, so might as well get the character looking like Harrison’.