We could simply reopen the economy at any point. There are more than enough counterexamples around to demonstrate that lockdowns do not eliminate Covid-19, and that a lack of lockdowns does not lead to endless piles of dead bodies in the streets. Lack of sufficient vaccination is not what is keeping the economy closed -- its usefulness in driving forward certain agendas is. The vaccines aren't even promising anything close to 100% effectiveness, particularly not among the highest risk groups (who were excluded from the clinical trials).
"We can go back to normal soon if everyone just does this one thing" has been the carrot dangled in front of people's noses to get them agreeing to measures of dubious effectiveness since the start of the pandemic. If the virus mutates in the fall and winter and boosters have to be rolled out again, we'll either "have to" shut the economy back down until everyone gets shots in their arms again (in which case these vaccines are a poor preventative against economic damage) or we'll accept the need to live with some amount of endemic Covid spread (in which case it was certainly not lack of vaccines keeping us from reopening).