Bitcoin should be used primarily for transactions where capital controls or other forms of monetary censorship exist.
Censorship is everywhere. Ever heard of legal tender laws?
This, however, is my view. There is simply no reason to use censorship-proof money for ordinary purchases. It's a terrible waste of resources for starters. A decentralized system has no reason to compete with centralized systems. They each do different things well. Using Bitcoin to buy goods from Amazon is like using a chainsaw to mow your lawn. Yeah, a chainsaw will certainly cut grass, but there are much better tools for the job.
All transactions do not need to be censorship-proof in a world where censorship-proof transactions exist. The possibility of censorship-proof transactions by itself will cut down on censorship because it will be seen as futile. So, it's important that any decision to change Bitcoin be considered in this light, and it's imperative not to make changes which move in the opposite direction (such as drastically increasing the amount of data needed to be shared in order to keep the network functioning).
They don't make laws against murder because they think it will prevent all murders. They don't see such laws as futile because they are not 100% effective. If they can restrict and reduce behavior they don't like, they don't see that as futile.
A network that can only support ~ half a million active users will not mean zip diddly shit in a world of 7 Billion people. The "drastic" increase in data shared is completely in line with technical advancements in bandwidth and hardware. Your argument is so foolish it makes me question your sincerity.
What's worse, a network that only supports censored transactions will bring down the wrath of the Establishment upon us. It NEEDS ordinary commerce or we will be persecuted.