I am not sure how likely this bill can be passed in Mexico's legislature and eventual signing into law...but let's just hope there is enough support for it but considering the fact that am sure IMF is now alarmed about it let's see if politicians will never give up in the face of possible threats and pressure like what happened in El Salvador. Anyway, what is noticeable here is that there is really that possibility for Mexico to make Bitcoin a legal tender...maybe not this year but there is always now that possibility no matter how slim and the fact that this is another good advertising or media mileage for Bitcoin.
That's why it is the duty of the legislative bodies to find a better way of passing the bill, since you are not a lawmaker you may not fully understand how it will work buddy, but those whose duty it is will find a way once they have agreed on the terms.
IMF couldn't get El-Salvador to back down I don't see what role they will be playing here (especially if the Mexican government is not indebted to them), they should already get the message from the actions of El-Salvador.