"SHA2 will never be broken in our lifetimes" is something I've heard JP Aumasson say many times, but that's based on the fact that there's no line of sight anywhere to techniques that could break it. But you can't say that about 1024 bit RSA.
If you want to pin me down on something slightly more formal: DRAM density scaling kinda stopped a few years back, systems aren't getting any bigger (much to Sam Altman's public dismay), and there is a superlinear matrix size requirement in factorization techniques that AFAIK no one knows how to fix. We can get the cycles to do it, but not the space.
Probably. Maybe not! But even so, it will remain cheaper to steal my secrets with the proverbial $5 wrench. RSA? It was fine.
I don't think you can extrapolate that into "slowing down". It wouldn't even be surprising if the next five jumps averaged 2 years each and RSA-1024 was cracked in a decade.
I'm sure RAM is an issue but I don't expect it to be a hard wall.