Not really. For example if 51% (or even 99.99999999999%) of miners decided they wanted to go back to 50 BTC block reward (or even a new 5,000 BTC block reward) that would simply create an incompatible fork. A fork which would most likely be promptly rejected by the consensus of users, merchants, exchanges, and service providers.

One can't simply force a change to the rules. All you can do is make a hard fork in the network. If nobody adopts your hard fork well you can keep mining worthless coins but people can continue to use/mine the existing fork.

Bitcoin is highly resistant to change (almost to a fault). It is a common myth that the person who controls the majority of hashing power can change the rules.