...dead air groups where the ops are barely alive and sit there not saying anything for minutes at a time. Well heck, you can tune around and if they're just sitting there not saying anything what can you do.
Go ahead and transmit. Ignore the bastards. They lost the frequency. It's now in use.
When you are queued up at the cinema, the bank teller or the vehicle registry, and some urgent or not-so-urgent business takes you away, you don't come back a little later and expect to go right back to the same spot. You relinquished your place. You go to the end of the line and start over.