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While some were taken up (looking at the brace position for example,) others were not. While improved brace positions will help if the crash is expected, as noted here, if the incident is sudden and unexpected, survivability will depend upon the aircraft structure and layout, including cabin and seats.
Yes, having flown a couple of months ago after a decade or so not doing so, I was conscious that the seat pitch and fixed seat back ahead didn't give me, or even my much shorter partner, space for the "brace position" as indicated on the procedures card. As said, aircraft layout is important.
The other cabin safety item is the huge size of many "carry-on" (or rather "wheel-on") bags and the thought that, even if there is a size limit, they have no weight limit and what load are the overhead bins designed round?
I also remember the aft-facing seats of the BEA Tridents and the "hanging from the lap-strap" feel of the take-off which, as said above, was what put people off.