That very power is a reason I think there's a few hold outs on the Democrat side that don't want to get rid of it. The senate is naturally stacked against the democrats as the parties are currently aligned so a few don't want to risk giving up that power. There's also a number who (at least claim to) believe that the unlimited debate is an important part of the Senate.
Personally I think it's a relic that's getting in the way of passing the exact legislation that will make Democrats more popular (and make it easier to vote to counteract some extremely blatant voter suppression happening in red states).
[0] consider 3 senators working 8 hour shifts of 8 on 16 off. That would be maintainable for a very long time.