Hey Tim,

Do you think new users should have as much bandwidth as they want?

No. Definitely no, in normal network condition the limits are good enough to use Steem without any issues.

Do you think that having users pay to have additional bandwidth (by powering up more SP) after they pass a certain point is reasonable?

The current model is fair to me, if someone need more bandwith, more SP will solve it.

Do you think witnesses should increase their block size now, or wait for AppBase and other optimizations first?

I will wait for the algorithm update, because existing one is affecting both sides, the abusers and good users. The block size change will not solve the issue, because the spammers will also get more power, and we'll have exactly the same situation again.

What changes could be made to the bandwidth formula to better allocate bandwidth across the users?

Maybe reputation parameter?... High reputation usually means that someone is trusted for the Community and abusers never have it high.