The new Senate bill's major provisions

[stpioc]

Where do the Republicans go from here? Well, repealing only parts of Obamacare ("Skinny Repeal"). But even that is devastating:

They are then expected to turn to a new plan: repealing only the most unpopular parts of the Affordable Care Act, including the individual mandate and perhaps the employer mandate and some taxes on the health care industry, while leaving large swaths of Obamacare in place. Few bills pronounced dead in the Republican crusade to overhaul the health care law have stayed that way. Still, the only viable path left standing amid the rubble, health care lobbyists and Senate aides believe, would be the much narrower “skinny repeal” bill.

Senate Republicans are rushing toward a vote on the skinny repeal plan with unprecedented speed, with just a few days to draft, debate, and vote to pass a brand new bill. If it were to pass, it would be a remarkable capitulation by Senate Republicans: an acknowledgement that even with a Senate majority and a Republican in the White House, they are capable only of repealing a few choice parts of the law they have vilified for seven years, while much of it appears likelier and likelier to remain in effect.

But for the millions of Americans whose health insurance has been at risk during the debate, the consequences from this slapdash bill could be severe. The Affordable Care Act’s Medicaid expansion that insured upwards of 15 million people and became a flashpoint in the Senate debate would remain in place. But even a skinny Obamacare repeal could destabilize the individual insurance market, putting health coverage for millions of Americans at risk.

Repealing the individual mandate while leaving the rest of the law in place risks sending Obamacare’s insurance markets into a death spiral.
Health insurers have long said that a compulsion for people to buy insurance is necessary in order for the law to work, after it required that insurers cover everyone and charge everyone the same premiums no matter their health. Republicans had even conceded as much, because their own bills sought to create some kind of replacement for the mandate.

Without such a mandate, healthy people could forgo coverage while sick people would continue to buy insurance. That would drive up costs for insurers, who in turn would increase premiums. As more and more people dropped out, leaving only the sickest people who need insurance most, the market could tailspin into a death spiral. The Congressional Budget Office estimated that repealing the mandate by itself would lead to 15 million fewer Americans having health insurance 10 years from now.

Senate Republicans’ incredible shrinking Obamacare repeal dreams - Vox

So, in order to safe face and pass anything that remotely resembles 'repeal' they're throwing 15 million of the most vulnerable people under the bus..

And then they blame the CBO..