Everything will be up for community discussion once we get to that point. We might stay PoW, we might go hybrid, or we might go full PoS, its really up to the community. I'm a fan of the hybrid model.
Great! It is good to have a good consensus among the community, in which, the decisions are based on the holders of EXP instead of the dev team. If the community decides hybrid, then it would be fantastic (as I love this model too) but otherwise, it is best to choose the right path in order for EXP to survive long term.
I have seen than ETH has suffered from many security flaws. Hopefully, Expanse can prove to become better as security, scalability, and most of all inmutability becomes its number one priority. Looking forward for more exciting updates!
