Nailed it. That's what i thought too or they can even play it safer and impose a 6-8 weeks restriction. Since by the time trading patch is implement the games will be out way longer than that. Am pretty sure atm most botted account which snipes wont survive more than 2 weeks.
2. level restricted trading (only can trade with similar level players or +- 1/2) might be possible as well but that will get more legit players whining.