Why the Republicans haven't announced a "replace" plan.

It's due out this morning according to the TV.  Democrats have been sniping at it, claiming that the Republicans should have a replace plan already.
   I'm pretty sure that actually the Republicans have a plan.  In fact they must have a dozen plans.  Problem is, they cannot get everyone (or even 51%) to agree on WHICH plan they are going to support.  Health care is a gravy train for patients, doctors, big pharma, insurance companies, hospitals, medical device makers, ambulance drivers, ambulance chasers, state governments.  Health care is 19% of the US GNP, that's a huge amount of money.  With that much gravy the spread around, no wonder everyone wants their fair share, and more if they can get it. 
  To pass anything at all, the Republicans need nearly every single Republican vote.  The Republican margin is thin, and in the Senate, a mere three defectors could sink anything.  I'm thinking that they won't keep their party in line, or even attract a few Democratic defectors, without president Trump getting behind ONE replace option and pushing it hard.  Which he hasn't done yet.