> Calling it 'weak' is giving it too much consideration
You can only say this if you're too ignorant to be worth a damn on the subject, or are insane enough to think that the people who have developed the protocol for the last 8 years are all misguided. If you launch into some conspiracy about Blockstream, Inc., then we'll know it's a combination of both.
> Remember that decentralization in bitcoin concerns miners, and miners only
And exchanges, merchants, consumers. If you have a stake in the ledger by owning or accepting BTC, then you have a stake in the monetary policy of BTC. If you have a stake in the monetary policy of BTC, then you can only hope to enforce it (or attempt to change it) by running a node.
That's before the mathematics of bigger blocks, where the decentralization of miners is threatened even by a 2 MB block size, as those with more hash rate get another bonus due to the latency increases of even a 1 MB block size increase.
If all that mattered in Bitcoin was the decentralization of miners, this game would have been over a long time ago. Anybody who thinks that even a landscape of thousands of miners, pooled by very few pools, is decentralized enough on its own, without others validating and auditing the blockchain, is too capable of assumptions to be let near engineering.
Why does every currency that has ever existed get devalued into dogshit by its policymakers? Every currency dies because those close to the mint can afford devaluation more than those further from it.