There are already enough cross checks I think with two houses and I think the President also involved in proposing/signing bills. A requirement for a 60-40 majority in the senate in addition to that is more of a block to progress than a healthy thing. The filibuster can be used by the powerful to block the interests of the majority.
Getting rid of the the filibuster is risky for democrats because this 2 senators per state rule inherently favours Republicans so there is a fairly high chance that Republicans will end up with the control of the senate in the future. However, from the democrats perspective, I think this is a risk worth taking. They will feel pretty silly if they use this argument to not remove the filibuster, miss the chance to pass their legislative agenda, and then the Republicans themselves remove it later on.
Also, if the filibuster is removed the democrats can add DC as a state (which will vote Democrat) and Puerto Rico (which might vote Democrat) to offset some of that future Republican advantage.
The world desperately needs the US senate to approve a climate change bill including a large carbon tax, and to be able to pass through the senate any international climate change deals. With the filibuster in place, I don't think we can get serious change, only a slight shift which won't be enough to prevent catastrophic climate change. And we have got to deal with climate change, so I think the filibuster has to go.
(Another option, although not my preferred one, is for Biden to sit down with leading Republicans and say look, my three top priorities are x, y and z. If any of those bills get filibustered, we will eliminate the filibuster. Push those three through and we'll leave it in.)
(actually all of the past 4 years)
