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Maybe it could become standard for everyone to make giant chips and use SRAM?

How many SRAM manufacturers are there? Or does it somehow need to be fully integrated into the chip?

SRAM is usually produced on the same wafer as the rest of the logic. SRAM on an external chip would lose many of the advantages without being significantly cheaper.

Yes, the limiting factor for bandwidth is generally the number of pins which are not cheap and you can only have few 1000s in a chip. The absolute state of the art is 36 Gb/s/pin[1], and your $30 RAM could have 6 Gb/s/pin[2].

[1]: https://en.wikipedia.org/wiki/GDDR7_SDRAM

[2]: https://en.wikipedia.org/wiki/DDR5_SDRAM

the cost is not the memory technology per se but primarily the wires. SRAM is fast because it's directly inside the chip and so the connections with the logic that does the work is cheap because it's close.

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