Nobody is willing to take a stance that strong, because they can't know that for sure. There could be further viral mutations, an unexpectedly sudden decline in immunity from vaccines, a string of unlucky superspreader events, a completely unrelated pandemic, or any of a lot of other uncontrollable, unknowable factors that could make continued restrictions necessary in an almost-fully-vaccinated population.
It's an unfortunate circumstance that 90% of people being fully vaccinated might not be enough to stop COVID-19 in its tracks. Even just 1% of people being unvaccinated makes millions of people who could catch, mutate, and transmit the virus. Especially if those people were loosely clustered together, and didn't take precautions against spreading disease, they could possibly keep the virus active (and hospitals busy) for a long time on their own.
It's an unfortunate circumstance that 90% of people being fully vaccinated might not be enough to stop COVID-19 in its tracks. Even just 1% of people being unvaccinated makes millions of people who could catch, mutate, and transmit the virus. Especially if those people were loosely clustered together, and didn't take precautions against spreading disease, they could possibly keep the virus active (and hospitals busy) for a long time on their own.