I seriously doubt that, but I'll let you elaborate on how journal logging the power affiliation of ships you've targeted is useful to someone who doesn't participate in PowerPlay.
Remember - the uses have to be useful, and there have to be "plenty" of them.
I'm not going to be holding my breath though.
#1. For API (3rd party web sites) to track ship movements as they relate to powers.
#2. For non-power players, as a means of warning when entering a region full of Power Play ships not normally occupied, such as during expansion operations, to avoid getting caught up in someone's cross fire.
#3. For Traders, tracking the movement of power ships to locate potentially good deals (buying), or sales "hot spots", based on the power in question.
#4. For Bounty Hunters, to find locations that may be potential hots pots.
#5. For Storytelling purposes, to follow ship movements.
And so forth - just because one doesn't pledge or support any given power doesn't mean there aren't potential benefits to seeing where their ships are operating.