Because raising the blocksize to 8MB out of nowhere is way more risky than staying with 1 while we search for ways to scale Bitcoin properly (raising the blocksize will never properly scale Bitcoin, not without something like LN). We don't want datacenters running nodes, we want to be able to run nodes on a single computer, what's so hard to get about this? That's the real sabotage, centralized nodes.
Dude, the 8 MB limit is not each and ever block. If the cap is 8mb, and the current block size is 0.5 mb , then 0.5 mb blocks will circulate. The 8mb block is only the cap limit, not the default size.
Therefore the block structure won't really be destroyed, it's not like you have to reformat earlier blocks to all have the identical size. Even now block sizes vary so that's not an issue.
But what you are doing here is artificially not letting the block size go up, and when the limit is hit, then people will compete for the empty space, so the TX fee will massively go up, and most people cannot transact and the TX confirm time will go up.
That is the real sabotage.
The blocksize will go up anyway, the question is, will you let it go up naturally, or you plan to make bitcoin a communist centrally planned currency. I hope not.
Having a bunch of "free space" that's unused due the cap being too big brings a lot of problems and possible exploits. What centralizes Bitcoin is not being able to run a node in your computer, not the nonsense you are talking about. Bitcoin will never scale to worldwide levels by raising blocksize.
Honest newbie question: how rising block size prevents from running a node on regular PC?
For every size you can find group that would benefit from it. 