Clearinghouse is not on Bitcoin. You're either on Bitcoin or you're not and Clearinghouse is not. It could be made to work with Bitcoin because Clearinghouse is a clone of Counterparty, but then, Counterparty is already on Bitcoin. If being on Bitcoin were not such a huge advantage the Counterparty developers could move it to another chain in a day or so. They won't because there is absolutely no reason to be on another chain, but it is possible. Any flexibility and security feature that Clearinghouse has, it has because the Counterparty developers wrote the code and open sourced it on GitHub so that other people could use it as well.
There are plenty of reasons to be on another chain. Faster blocks, friendly relations with chain devs, quicker/better implementation of new features/bugfixes/etc.
Your absolute denial of them makes your position less reasonable and thus weaker, not stronger.
As for the forced choice between "either on Bitcoin or you're not"...treechains are coming!
http://bitcointlv.com/en/Agenda/Day-2-October-20Yes, this is what I'm learning. I will say for certain, I know that a big social gaming co might be the first to make this jump to clearinghouse. From what I'm told, they simply weren't happy with counterparty for whatever reason. Though they haven't ruled out counterparty, they seem to be more intrigued with clearinghouse. I have no idea when this will happen, but I'm told the first move will be merging a type of betting game on the platform as an experiment. I was also told that they are even exploring offering company shares through the platform as well. Meanwhile, I'm still just sitting here trying to figure it all out.