Yes, miners can turn off the bomb, but that requires that they coordinate and determine a schedule for the hardfork that turns off the bomb (you need a hardfork

Yes, miners can turn off the bomb, but that requires that they coordinate and determine a schedule for the hardfork that turns off the bomb (you need a hardfork to turn it off). This scenario is definitely possible, but it requires a little more work than "one guy keeps running an old eth1 node".