Consequently, the BEA recommends that:
€€ EASA require a review of the conditions for the functioning of the
stall warning in flight when speed measurements are very low.
[Recommendation FRAN‑2012‑051]
Already done - CS25 Amendment 6 25.207 (c) - introduced
after AF447 reads:
Once initiated, stall warning must continue until the angle of attack is reduced to approximately that at which stall warning began. (See AMC 25.207(c) and (d)).
This effectively would prohibit any speed related cut off of warning