That question could be answered from several perspectives.
Yes, seniors don't always return to the workforce by choice. Sometimes, they do so out of necessity, because they can't support themselves on their retirement pensions. This is already a problem.
On the other hand, I believe seniors will continue to be stigmatized in the labour market. If anything, the pandemic has made it worse. Because seniors are considered to be more vulnerable, employers have been hesitant to hire experienced workers, even though we have programs with financial incentives to do so. The incentives have not been enough to convince employers, who feel that hiring experienced people costs more and is more risky.
For all these reasons, I don't believe this problem is going to go away in the next few months, or even years. I think it's something that needs to be seriously addressed, because, with life expectancy on the rise, there will be more older workers. So it's an issue that we are really going to have to deal with.