Here's a question from a layman: if untold trillions of new universes are being created all the time, where is all that energy coming from to create them?

I'm not sure this question is meaningful in context. It would be like asking where all that time is coming from. For both, the timelessness discussion suggests that they all just are. Everything is. Universes are not coming into being or leaving, and there is no "now" pointer that is sliding along a timeline. It is also not meaningful to ask "where" they are.

But they feel meaningful, as does "now." That presumably means that I should gut-assimilate MWI.