1. do you think de-dollarization will make more people and country adopt Bitcoin?

De-dollarization is just a politic, and it gives no impact to the bitcoin. To assume de-dolarization gives will push people to buy bitcoin just BS. The fact that most of bitcoin volume is still concentrated in USD pair. So de-dolarization is just a myth.
2. what do you think is the biggest thing stopping Bitcoin from playing a bigger role in the global economy?
Government and regulation.
It is not "completely" nonsense. It does make sense that people would invest in these things, because we are talking about something that would be alternative. Not that we are seeing everyone get out of dollars completely, of course, and not the ones who do; all end up with bitcoin. So that means, even if dollarisation happens, bitcoin will not go up that much. However, it is also not a bad thing either; even if a few billion dollars of it goes our way, that is not a bad thing; it is a benefit to us.
So while this may not be something too large to celebrate at all, it is also not something that we should not care about either, and we should be happy that it exists. I am not saying make a big deal out of it, but do not consider it as nothing either. We need to realise that every small bit helps, and in this case it is a small bit for sure, but it is also nothing either, and we can be just joyful for the smaller things in life like this as well.