Back in 2008, when Marvel's Amazing Spider-Man switched to a thrice-monthly publication schedule, I did a little math to figure out when the numbering of ASM would catch up with that of DC's Action Comics. Assuming continued thrice-monthly publication for ASM and monthly for Action, I determined that it would be in January 2020 with issue #1016.
But as it turns out, that's never going to happen. At some point ASM swtiched to twice-monthly publication, which would have slowed down the progression. But then last year DC cancelled all of their DCU titles and started everything over at issue #1, including the long-running Action. And now Marvel is cancelling Amazing with issue #700.
I suppose it's possible that at some point in the future DC will revert to the old numbering scheme for their titles. And I'd imagine that Marvel will at some point resurrect Amazing (I give it maybe a year...) If those scenarios happen (and if this blog is still around...) we'll recalculate.