You are right that 100% of populations don’t get infected since, among other things, viruses tend to die out after herd immunity is reached. But the current estimates about the current variations run into the low 80’s. Still lots of people, but that’s moot mostly because vaccines were developed in record time and are slowly becoming more widely available.
No, covid isn’t bad compared to SARS or other diseases, but those others you never get in pandemic numbers.
Regarding the exit strategy...I worry about it too since no one seems to be discussing what that is going to look like. Collectively we have embraced eradication, but since eternal isolation isn’t a practical path the government needs to start defining milestones and stages of reopening to the larger world. We certainly cannot let anti vaxxers inform policy on acceptable risk, one way or the other.