Comment by Tor3
A digital ID is not doing all of that. The way it's implemented in Sweden, just to take an example already mentioned, is simply to identify you, and only for certain parts of society (mostly governmental services, banks, insurance and the like, and a few more). It's not about authorizing you for travel. If you need an ID for picking up your valuable shipment from the post office then you simply show your driver's license or passport, you don't use a digital ID for that. At all. If someone took away your digital ID then that would mean zero for your internet access, and zero for your ability to travel. It's not used for that at all. What would be a problem is paying the bills, because the ID identifies you for using network banking. However, alternative ways for identifying you for the latter are far worse concerns.
But GP raise a valid point: If IDs are ubiquitous and commonly used for non-government business, the government does implicitly gain substantial "veto power" over non-government transactions (by revoking existing credentials or not issuing new ones).
Availability has to be ensured just as much as security and privacy in such a scenario, and that's not trivial. (I still personally think it's worth trying.)