I think the "image problem" is a bit overblown. It is and was definitely there and the whole back and fourth with their data as well as the big nationalism show-off didn`t help but I expect the scale of the problem to be quite irrelevant.
At least in Germany many of the "AZ doses unused" stories are due to logistical issues and not people refusing to take the AZ one (as well as like
@Pogue Mahone said, it so far not being given to +65 years old). There were a couple of headlines of a region where apparently +50% doses went unused because of people not turning up ... and it turned out it was down to many not being informed not because they refused it. But it made good headlines and many narratives in Covid times are created even faster than usual.
A lot of health authorities and politicians have promoted the AZ vaccine now after they realized that an image problem was created and I think it won`t be a big discussion point couple of weeks from now.
In recent weeks I`ve become quite optimistic with regards to the challenge of vaccine scepticism and I think the percentage of people taking them will be far above 50-70% polls are showing in Europe. The reason is that with Covid being such a big presence in everyone`s life and the speed of vaccinations going forward so quickly, everyone will soon know multiple people who got vaccinated. And while trust in politicians or companies is low, everyone trusts his own abilities to observe one`s social surroundings. And they will realize themselves that 99% simply feel a bit sick for a day or so and then are completely fine.
The mystic and for conspiracy people compelling stories of "NURSE XY DIED AFTER TAKING COVID VACCINE" lose a lot of relevance and dramatism if 30 of your friends and relatives have had vaccines and are walking around completely fine.