What do you mean? This was just announced, no? Are there any sales/pre-order figures already?
Also, how would you even go about analyzing the counterfactual of whether the number of people who would buy this spec are "plenty" compared to the number who would have bought a spec with more RAM had it been available?
Well by virtue of the fact that they've sold these un-repairable/ un-openable macs for 3 years now, and they're refreshing it instead of killing the product - all these things indicate consumers like the current approach
Not everything you see is designed to be useful for you specifically