@danwentzel they could say that, but it would be undermining democracy if they make such an announcement.
The democratic process elected Trump. I'm sorry the DNC put forward a candidate who was so bad that she lost to a convicted felon who lies all the time, but they should probably do better.
In the meantime, while they're working on fixing their own house they should not undermine the rest of the country by refusing to engage in the governmental processes.
They should build up, not tear down.