Grenadines are simply wonderful ties. Great visual interest for a solid tie. Business appropriate, as opposed to some other solid ties that have textural interest (raw silk) or slight variegation (some wool ties). This was true before SF came about and true before places like J. Crew started carrying them, so I guess I don't understand how their popularity within certain small circles really changes anything.
They are classic, as much as that word is overused, and are unlikely to ever look dated, even within certain circles in which a grenadine might be recognized (unlike perhaps patterned grenadines).
As far as general standing out, pocket squares are probably much more likely to be perceived as screaming something than any tie ever will.