I think the interesting thing here about the M2 Pro Mini is there's now a Pro chip with 16GB of RAM, at a lower price than Apple's ever offered. This is important because while you can pretty much only get CTO options through Apple, you can get default configs through a variety of resellers, who will run discounts - meaning that one may be able to find a 16GB M2 Pro mini for around $1100 in a few months.
I don't think it's likely, but I hope this also means that the next-generation, entry level Studio gets something beyond 'big heatsink' as its Unique Selling Proposition. I'd like to see the differentiation be user-upgradeable storage and/or user upgradeable RAM (implemented as secondary RAM of some sort, after the on-chip fast RAM is full?), but I'm likely to see pork wings at the local bar before that happens.
And before people say it's impossible for Apple to offer RAM expandability on M series chips - I'm sure it's something they've had to figure out to support a Mac Pro transition. I don't think anybody's going to order a terabyte of RAM straight from Apple...