I don’t think so. Different use cases need different amounts of RAM. Same goes for processors, some work loads are better handled by faster processors while others can benefit from higher core counts.I’d expect future Macs (especially the consumer side first) to be more iPad-like than ever. Count on stuff like FaceID, longer battery life, cellular connectivity options, Apple pencil support, ProMotion, and multitouch screens - I’d say.
Choosing RAM or processor type will disappear... just like on the iPad, you can pick storage and color.
Maybe the macbook air gets just one processor model and then you can configure the storage and RAM.