The 1 in 10,000 stuff is just a figure plucked from the air, though. If it were genuinely that high I wouldn't be so "cold", or whatever description you choose. But it's not -- no evidence that it is, nothing credible, so the risk is essentially imagined. As to separate v. together, it really makes not the blindest bit of difference. Not with the other multiple jabs, eg DTP, that critics of MMR are curiously silent on. Possibly money plays a part, but even then I hope it's obvious that it can work both ways. Those producing and selling the separate vaccines have just as much interest in discrediting the combined jab as MMR sellers have of dismissing the perceived risks.
It should remain the choice of the parents, though. My hope is that they would make as informed a choice as possible, and one that is in the best interests of the safety not only of their own children, but also of others around them -- immunity, or lack of it, is not just a matter of your own health due to herd immunity, hence the 95% target rather than 100%, as 95% would be enough to protect the remainder.