Playing devils advocate here - but I for one am glad to hear about this change as pillar spamming is a load of Horse$hit, irrespective of intent (protection of resources, pillar griefing other players, etc).
Beaver dams blocked - tame a couple of snails or kill some mantis and farm some stone - CP problem sorted.
Protecting large metal/obsidian nodes - well that should be part of the no build zones, but maps like Ragnarok have ridiculous quantites build into the cliffs all round the are perfect for quetz/anky harvesting.
Spawn/beacon points - well thats a no brainer - the devs really need to make those no build zones and identify them as such (structures like obeslisk terminal/tek teleporter.
As for dino spawns, just suck it up and go searching the map like every other normal person - if wannabe alpha twat waffles didn't pillar spam the crap out of all the decent build zones - noobies would be less inclined to build in some obscure dino spawn place.
The only downside of the change is that it people are going to find out the minimum structure requirement and we'll go from pillar spam to small hut spamming - Another forum user addressed this issue in another post with a land claim/flag system where by players have a flag/token (single) that they can place down to claim land and then build out from there - if they want to relocate they can move their flag but the existing structure rapidly decays (24-48 hrs - allowing time to relocate dinos/resources, but unable to relocate flag again within 72 hrs preventing people moving back and forth to reset timers). Additionally as a tribe they could be limited to 3-4 flags preventing Alphas spamming and claiming an entire server and push out/pushing all other players trying to establish themselves.
Mic Drop - Rant over.