The preprogrammed difficulty bomb is not to stop people who want to intentional stay on the old fork. It's to stop the old fork winning consensus by default due to people who don't actively upgrade.
Pushing through protocol changes could be hard if everyone who takes the default action of doing nothing is counted as a vote against any protocol change. I think we see this with bitcoin where change is very conservative and slow because any change has to gain enough support to be actively upgraded by a majority.
The difficulty bomb just means that if there is ever disagreement about a protocol change, everyone will have to actively choose a side rather than the 'no' side getting all the non-active default votes.
It basically just means that changes can be done faster.
Pushing through protocol changes could be hard if everyone who takes the default action of doing nothing is counted as a vote against any protocol change. I think we see this with bitcoin where change is very conservative and slow because any change has to gain enough support to be actively upgraded by a majority.
The difficulty bomb just means that if there is ever disagreement about a protocol change, everyone will have to actively choose a side rather than the 'no' side getting all the non-active default votes.
It basically just means that changes can be done faster.