Dude it's private insurance that's like saying if I have insurance from Company A and someone else gets insurance from Company A my premiums will go up. My Premiums go up due to medical costs and Insurance companies wanting to pad their profit margin.
And the medical costs went up because we added millions of 20 somethings to their parents insurance instead of them getting their own or skipping out like they did in the past. There are more people using the system so the costs for the system have gone up and thus its charges must go up too.
It all comes down to cost sharing. In the old days young people skipped out on health insurance because they were young and healthy. This creates a situation where only old and sick people have healthcare and thus the people who have it are the ones most likely to use it and thus costs have to go up to cover their usage.
So to bring the cost per person down you have to add more people to the system, preferably people who won't use the services. So you do this by extending coverage to cover 'children' in their 20s. So now we have a few million people who would not have had any insurance before paying into the system but not using it as much as the older sicker people. Thus the cost per person has gone down, but the overall cost of the system has gone up.
That is the whole point of Obamacare and the mandate. It requires everyone to pay into the system even if they aren't using it. The people who are in the system and using it make out because of all the new money flowing in, but the people out of it and not using it lose because they are now paying for something they aren't using.
Which brings us to the next problem. All the new people decide that they want to use their new services and start using the system and thus overall costs go up again and we are right back where we started.
I think the lesson of Romneycare is that mandates don't work because costs of gone through the roof. Sure everyone has healthcare now, but everyone had access to healthcare before. Our problem has never been access to healthcare our problem is the cost once we get healthcare.
The best solution at this point looks to be user pays types systems such as many companies have adopted. So insurance covers the costs of somethings and helps to cover the cost of others, but you have to decide whether you want to pay for that x-ray or not and thus costs are contained.