Translation : At the moment, Mastercoin and XCP are only parasites from bitcoin dev's points of view...
Sorry for being so direct but this is what I read as a non-technical investor.
Thats how I see it too. The arrogance of these guys is amazing. MSC and XCP is extending the functionality of Bitcoin and may be something good have and compete with NXT, Bitshares and Ethereum.
XCP can move onto other chain, or I suggest get its on PoS chain. This will also prevent the archaic 10 minute wait.
When you have an economy as large as bitcoin in your hands, you tend to be conservative when implementing changes and paranoid when considering risks. And in my opinion that's how it should be, I see no arrogance in any post TBH.
As I said before, that was a possibility from the beginning and this was (is, since nothing is broken ATM) an experiment.
If you make people choose between BTC or any other coin (including in chain), the choice is easy. Choose Bitcoin.
Having said that I will keep an eye on Bitshares and Ethereum for sure since they have the opportunity to implement things that bitcoin will take years to implement (but will do it ultimately).
PoS? PoS is not working as it should as far as I know. The PoS chains that are on the wild are usually centrally checkpointed because of security issues.