errr, the plot of toy story 3 sounds like part 2. haven't they already dealt with the issue of a child growing up and moving on to new things, thus forgetting his/her toys? that was what really moved me in ts2: when the little girl emily discovered make-up, boys, etc, and abandoned her toy jane.
they should base the plot of toy story 3 on the sideshowcollectors.com issues: a new toy comes in but andy is very unhappy with it cos it has a lousy paint job, small dents n cracks, loose hip joints, etc. so he sends it back to get a replacement but the replacement that comes back is even worse! so andy gets into a nasty mood and does a youtube video to complain about it. the video gets a huge amount of publicity thanks to the secret efforts of buzz, woody and gang. finally the greedy toy company agrees to improve their QC standards and andy is hailed a hero in the collectors' community. the end.