My main concern is that if mini blockchain does work. If it works, then Monero can adopt this. Then value of XCN will not rise as fast
Monero will not be able to magically adopt XCN's mini-blockchain technology. Blending the two is no where near that simple--if even possible.
The XMR devs have already said it's not possible. Ring signatures somehow prevent this. I have no idea why, but they should know.
I think maybe ANC (anoncoin) might be able to do it. They are ready to release their implementation of zerocoin in little over a month.