Also ask if adding the randomized delay would be compatible with use of I2P as a foundational network layer for general network functions? Answer: No
Not sure I understand, this delay is useful when sending coins because couple of additional seconds is worth the wait. We don't need other general network functions - or do we?
To get to Visa scale with Bitcoin brings us to 80 Terabytes.
Monero claims 5 - 6x bloat (and I disputed that, it might be higher). So heading towards a Petabyte just to reach Visa scale.
But..
Do we expect and require Visa scale and micro transactions? Bitcoin is fine for that. Remember you yorself claimed we are running out of time because of coming global sovereign debt collapse and currently there is nothing better on the horizon that would stand up to your criticism

for now let's just stick with what we have and concentrate on the main goal - it doesn't include micro transactions on Visa scale.