A referendum can court a lot of trouble. But things will be worse without a referendum. The cascade of proposed changes means many groups aren't happy with the draft. Indeed, the abundance of proposals means the Thai public wants to take part in this process.
The large number of proposals, on one hand, makes a referendum more dreadful in the eyes of the drafters and the junta. On the other, it underscores the need for the final draft to get some legitimacy, which only a referendum can provide. There is perhaps just one option to resolve this dilemma - to allow Thais to vote on the draft.