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.
You can't simply drop all of the old portion of the block chain as XCN does because:
1. Due to the privacy features, it isn't clear what is spent and what isn't spent.
2. The possibly-spent outputs are still used and useful for mixing, so even if you could drop them, you wouldn't necessarily want to.
Regarding scripting, Monero theoretically has its own simple form of scripting (not Bitcoin scripting), but even that isn't used and may not even be fully implemented (and might be dropped or changed). So that part wouldn't necessarily be an obstacle.
Simply taking the mini-blockchain design from XCN and grafting it onto Monero without changes is impossible. We do have our own ideas for lightening the blockchain that are in some vague ways comparable to XCN, but in any case that is not a near-term development priority.