>Dropping DDR-4 is anything but meaningful. It'll easily last 10 more years, machines from this gen are still much more affordable and quite powerful. In fact for most dev and gaming workflows the difference between the DDR-4 and DDR-5 generation of hardware is more or less negligible. I am exaggerating a bit -- but really, not too much.
How much % of the DRAM market do you think is made from computer enthusiasts upgrading their Zen 1/2 CPUs to Zen 3? Note intel and AMD both switched to DDR5 well before the exit from DDR3/DDR4 ("2024-2025", according to the complaint).
The mere "enthusiast" word in your question suggests the percent is not too big. But I am not sure I get your point -- elaborate, please?
Note though that for Intel, the first gen of DDR5 CPUs also supported DDR4, and many buyers bought the DDR4 versions of their boards because at that point DDR5 RAM was much more expensive for gains that were marginal at best, which effectively makes Intel’s following generation of DDR5 CPUs the actual transition point.