So in order for a TA analyst (I won't judge the TA science per se, I'll keep it with the people) should make correct predictions most of the times (or at least, correct enough to break even).
So here is my suggestion: Every TA in Btctalk keep a note about his predictions in a text file (sure you'll post about it here, but I don't want to go through hundreds of posts) and then present them to the btctalk society to judge his TA skills.
The file format is quite simple
dd/mm/yyyy: (predicted price for the day) | (predicted future trend)
Who's in?