Miners might not want to change because a 1MB fixed block forever will make them rich, especially now the hard competition already made their profit very thin
However, I see this as a future problem that miners overtake the control of bitcoin and there is no way to fight against it
Imagine that world government have implemented new rules to regulate all large mining pools so that they only can process non blacklisted transactions (blockchain analysis is the new trend), and all the transactions must be traceable to its owner with name and address, this will make the trace highly practical from AML and KYC point of view. As a bitcoin user, you just can not do anything about it, because all your transactions are processed by government regulated mining nodes
You can change to another algo like skrypt, then again those large mining pools will be regulated if there are just a few, and with a lower hash cost coin, the value of the coin also goes down until it reaches mining cost
So it is very important to decentralize the mining, since controlling the mining nodes is much more effective than control the other part of bitcoin ecosystem, it is equal to control the central bank of a monetary system. We know that central bank is independent from the government, in this case, large mining pools have no way to reach that kind of independence
Tracking name and address through the blockchain would be incredibly dangerous... Would you want to be associated with say 10,000 bitcoins with full details on the blockchain on where to steal them?
Something like that will never work and if nothing is done to prevent something like that from happening, everybody will abandon ship. Maybe litecoin will get some attention than.
Government will do exactly like they did with exchanges, first define mining pools as a money transmitter service thus require license to run (I think BTCGUID was closed due to this requirement), and when pools get that license they become a financial institution, thus must follow AML and KYC rules, e.g. all the miners connecting to them will have to submit their id-card and el/tele bill to living address....