Re: Launch vehicles, I can say with 100% certainty that Space-X will not sign up to fitting some of the larger satellites, nor do they seem at all willing to make the--in my opinion, minor--changes needed to do so. Apparently they have enough business to make it not worth their while.
And about private vs. government investment, guess which customer signed Space-Xs largest and most lucrative contract, which provided a sustaining cash flow for *development* of necessary capability at a time when things were, quite honestly, getting pretty rough? The government. Who else would sign a contract and pay for services not yet available nor proven? And guess which customer Space-X is targeting with their current effort? Don't think Space-X doesn't have lobbyists in DC. You think it was Obama's idea that he give a photo op on the Space-X launch pad?
I'm not saying Space-X isn't the best in the business, because they really are (by far). But they are, in large part, funded by the government, which paid for development work and which pays 2-3x what commercial customers will pay for similar services. Would they still be around without any government money? I'm really not sure. Things would be a lot more tenuous at least, and they would not have come as far as they have.