One of the concerns is that we don’t have a definite time frame to reach that point. Is it February, April, next summer, beyond.... Nobody knows! Meanwhile people and businesses are running out of money which inevitably leads to considerable suffering for those affected. I can’t see how the economic damage can be easily reversed either.
Another concern (that I have anyway) is that these vaccines turn out not to be the magic bullet we hoped they would be. There are already ‘experts’ warning us to expect restrictions long after the vaccines have been rolled out. It’s also now clear that we will see regular mutations of the virus (it’s a coronavirus after all) so at some point a new strain may require a new vaccine. I expect the existing vaccines can be altered relatively easily to overcome this, but what do we do in the meantime? Lockdown for a couple of months? There’s a danger we enter a never ending cycle here.... Sorry to sound negative/alarmist but these are the things not being widely discussed so it’s left to the likes of us to think about them!
I think the idea of on-off lockdowns for the next few years each time there is a new mutation of the virus is going to be a politically very difficult to achieve.
A never ending cycle of lockdowns, lifting of restrictions, more lockdowns is going to cause untold damage to the economy and peoples mental health, and there will come a point when the cure becomes worse than the disease.
I would expect that, from next autumn onwards, COVID-19 is managed in the same way as seasonal flu, in that people are vaccinated, and there is general advice about self isolating if you feel unwell. Rapid testing should become widely available, to the extent that those who are most at risk are tested on a regular basis, regardless of whether they have symptoms. You may see more emphasis on the old slogan "...coughs and sneezes spread diseases...", with advice about covering your face with your hands if you cough or sneeze, and carrying portable bottles of hand sanitiser to keep your hands clean when out and about.
Another thing that would be fairly easy to implement is to make far more people eligible for the free flu jab. This would reduce the pressure on the NHS next winter, and enable them to cope better with any COVID-19 cases.