Sarah Jane and Jo Grant-Jones didn't get to voice their disappointment with being completely dumped for so many years until NuWho and SJA.
It's a bit inaccurate to say Jo was "dumped" since she chose to stop travelling with the Doctor. I think her main issue was that the Doctor never checked in on her in all the years since.
Oh, absolutely, looking at it rationally, she left the Doctor, but, yea, he didn't leave a number, and never visited again, makes you feel really inadequate, compared to Rose and then Sarah Jane (with her three NuWho Doctor Adventures), and now Amy/River. *Of course, any Classic Companion could claim this "Abandonment", and that was kinda the point, it didn't really register until NuWho.