.... How readily available is this valid ID for all segments of the population? Seems to me that there is small, but significant share of the population where getting such an idea is not a reasonable expectation to place upon them. So then the question is how do we get such that these people can vote both in the immediate election where they won't have an ID and in future elections. ....
If you are an American citizen and you do not have a valid and current ID of some kind then you've made the decision to not be a part of the rest of American society. There are obviously going to be some limited exceptions like those who are mentally ill or the elderly who no longer have agency but America was not built to accommodate each and every exception to the rule.
The United States is a land of opportunity and second chances but you do have to jump through some pretty basic hoops.
If you are an adult ( and not in the range of some limited exceptions) and don't have current and valid ID = You've chosen not to be a functional part of this society.
You actually need ID to do things in this country. Like get on an airplane or start a bank account or get a library card. It's a long list.
If you've chosen not to be a functional part of this society = Why should you suddenly be this major sweeping issue to make you a functional part of this portion of civic responsibility but not on any of the other issues?
Jumping through some pretty basic hoops is not racism. It's not bigotry. It's not an attack on some segment of society.
Some people don't want to work. OK, that's a choice. Then don't eat. Don't have a roof over your head. Don't have regular access to a toilet. Some things are a "hoop" of life that just need to be jumped over.
Some people don't want to have basic hygiene. OK, that's a choice. Then don't get any sex. No chick is going to blow you if you smell like used gym socks buried in a septic tank. Don't get hired in job interviews. Don't expect people to give you normal everyday social interactions.
Some people don't want to stop using drugs or shoving too much food in their face or getting sauced up on booze. OK, that's a choice. Don't expect to much success in finding any kind of peace of mind or long term health.
There's just some things you need to do in this life and in this society to have basic survival and basic function. Having a current and valid ID as a pathway to many of these things is one of those hoops that need to be hurdled.
Again, there are going to be some limited exceptions, but don't expect the rest of America to bend over backwards and subsidize those who choose not to get into the game of life.