Highly doubt it.  The few times IRS officials have been asked, they have said no plans to do so.  And there does not seem to be any groundswell of agitation from taxpayers pushing for this.

As a society, we more or less have adapted to the pandemic at this point, which is a very different situation from last year, when it really came into view into mid-March and offices and schools suddenly shut down, giving urgency to postponing the deadline only a month away.

That said, I agree with you the tax season extension last year was a blessing in disguise for preparers and I would be happy if it became permanent.  Was able to take on more clients while spreading out my hours over an extended busy season.  Didn't really understand all the carping from other accountants.