Moving energy around through ships and pipelines would be akin to the internet running through a "vast network of little tubes."
1. The existing electrical grid has sufficient capacity to power both houses and vehicles for the foreseeable future. As the inevitable transfer from fossil fuels to electricity happens, adding more capacity is well within the capability of existing technology.
2. Edison and Tesla argued strenuously over the advantages and disadvantages of AC vs DC for power transmission. Edison opted for DC, but lost handily because AC can be stepped up and down with transformers and is much easier to handle than DC.
Resistance loss happens regardless of DC vs AC. Both are subject to Ohm's law, E=IR. Voltage equals Current times Resistance, so the voltage drop across any conductor is equal to the current traveling through it times its resistance.
Energy loss in conductors is far less than the energy required to transport a similar amount using trucks, pipelines, or ships, and even that is improving as we develop better and better conductors, and eventually, superconductors which will have no loss at all.