I remember reading an article a while ago detailing how the network could work transactions faster if some value was changed, but Chinese farmers refused to change the value for whatever reason and because they represent such a large share of the network the whole network is stuck with those sub-optimal values.
It's already possible to fully "track/monitor" (without centralization) because all transactions are recorded permanently in the blockchain.
As to "censor" it would not be possible even if Bitcoin was mostly centralized (I assume you are talking about miners centralization). As long as some miners are honest, even if it's a small fraction, your transactions that others attempt to censor will still eventually be confirmed, whenever these honest miners find a block, because given the P2P nature of the Bitcoin protocol, all transactions can reach all nodes.
You want to ban that so drug dealers have to find a more creative way to make money? (And they'll find a way. I'm still surprised they managed to find a way to use Tide detergent as currency to sell drugs).
http://nymag.com/news/features/tide-detergent-drugs-2013-1/
What point are you trying to make? Sounds an awful lot like the "Let's ban peer-to-peer filesharing, because it's used for copyright infringement" argument.
It's like the invention of the internal combustion engine. In the early days (late 19th century) someone might look at it and wonder how noisy polluting engines can make the world better. A hundred years later, it's very obvious that making transportation easier and faster enormously contributed to improving the world's economy.