It gives them two years to come up with a worse replacement. The President and virtually all the Republicans in Congress are for repeal and replace, not repeal and leave it at that.
The good news is that there is more support for a straight repeal than for any specific replacement. Then the replacement can be scored against doing nothing, rather than against the unsustainable plan we are (hopefully) getting rid of in a separate bill. Best of all, if the Democrats oppose all replacements, we end up with nothing, which is my top choice. Then the democrats share the “blame” for a straight repeal.