Unpopular but necessary
I've recently checked. It is now impossible to stand in the town centre in Nottingham (my home city) and not be in range of a portal - except one spot in a carpark.
Portals used to be cool things to find. There used to be a little challenge, you had to walk to find them. Now, you literally can't not be in range of one in many cities.
While I recognise that there are absolutely many many places where low portal density makes it hard to play, there are now too many places where it's just plain boring to play. There's no challenge any more.
I would like to propose an immediate ban on all new portal submissions where there are more than 4 portals in a level 16 S2 cell.
For those not familiar with S2 cells, that means an area roughly 100 metres by 150 metres (it varies).
Over time, I would further propose once a month, to remove the least upvoted portal in each S2:16 cell, down to a minimum of 4 per cell. Or maybe just wipe them out in some story based cataclysm. I honestly don't care, but, the game is just not working for MANY people, the way it is.
As a point of note, this suggestion will utterly trash my local farm. This will directly hurt my kit supply, but I still think it would make the game better. I'm not saying this for my benefit, I'm saying this for what I feel is the game's benefit.