I have been thinking about this, and one theory I came up with was a switch chip between M1 Max chiplets... you have 4 (or more?) M1 Maxes connected to the same switch chip... it might add latency for some tasks but it would be one way to scale without going to a new M2 processor... Then again, M2 could come out in June at the WWDC, doubling everything and adding 3 more ultra connect things to each M2 Max, allowing unlimited (ish) upgradability... but, probably not...