If the concept of Tebow ever making the majors is a legit idea he needs to go through low A and high A this year. Then he needs to go through AA and AAA next year with a September call up.
If he fails in high A the rest of the season there are two options; 1) end the charade and release him or 2) continue the charade and sell tickets at their Mets organization owned high A team (coincidently in Florida) next season.
For whatever reason I believe Tebow is only doing this for publicity. For the Mets it took headlines away from the Yankees until they turned the corner this season.