Code

Why not separate out the wallet support code from Bitcoin Core by default (instead of the other way) since most people are running other wallet clients anyway and it unnecessarily increases the attack surface?
Why not stronger encouragement of Tor/I2P by default to avoid painting a target on newcoiners backs?

Econ

What will a deflationary economy look like? (Debt, quality of products, level of self-sufficiency of households, consumerism).

Privacy

What ratio of VPN:s are honeypots, decreasing privacy?