This is simplistic and silly political rhetoric that you're regurgitating. "ObamaCare" is complex, and much more than just the private healthcare exchanges from which a small portion (< 10%) of the public purchases healthcare insurance.
Once again, if it so so horrible, catastrophic, and collapsing, why isn't this bill a simple repeal bill that has been promised for years? When Republicans repeat the mantra "ObamaCare is collapsing," presumably they're referring to the rising costs and departing carriers in many state private healthcare exchanges. There are things that can be done to improve these issues. The Democrats have been open to change. They're not denying these problems.
I do agree, that the best result for Trump politically, is for this bill to die quickly today, and for him to move on. He can blame the Swamp, suggest he never liked the bill anyway, and continue to blame every healthcare ill on the Evil ObamaCare.
Don't confuse this "best result" with "success." This bill's death would give Democrats plenty of ammo for hyperbolic political rhetoric. The bill will always, whether it passes or not, give Democrats abundant evidence of Trump's broken promises on healthcare.