[stale2002]

Kinda sorta.

Yes, users can reject Hard Forks.

But the problem is that soft forks can do basically anything. Yes, even increase the block reward, in a roundabout way, (by using added extension blocks that have special rules, and then requiring all transactions to go through the extension blocks.)

Although from the perspective of a non-conforming Node, this would just look like a DDOS style mining empty blocks attack.

At this point the only thing that users can do is change the Proof of Work algorithm. .... But, if the big players in mining have a bunch of GPUs on standby... well, it is not even guaranteed that this will work.