do they have a plan
Of course not. Otherwise, they would make any kind of testnet for BIP-110. Then, they would also know, that unconditionally activating new rules with 2.5% hashrate is going to make their chain 40 times slower. If they didn't test it then, why should they test it now? It seems they like testing things in production, without any testnets.
we switch to blake and God will guide us for the rest
It would be funny to see different versions of Knots, being incompatible with themselves. Who knows, maybe some users won't agree to change the Proof of Work? Because unlocking the BIP-110 chain will obviously make it more spammy, than it currently is. And if their hard-forked chain, with 10 minutes per block, will contain all kind of BIP-110-compatible spam, then who knows, if some rollback to SHA-256 will be needed.
oh ye of little faith one must follow the savior til the end
Does it mean using the SHA-256 version?
BIP-110 is the best soft-fork in the Bitcoin history.
Why people should change their Proof of Work, if BIP-110 is the best soft-fork? It successfully stopped all of the spam, what else do you want? If you have one block per few days, then your chain is less spammy, isn't it?
Also, if it is the best soft-fork, then imagine how the worst one could look like.
Edit:
Nobody is going to be using P2PK.
Of course. And
my transaction doesn't exist, right? Or
its second version isn't confirmed on BIP-110 chain, right?
So everyone's coins would be at risk.
No, because
miners already moved some of their newly minted coins. And every coin they touched is also splitted correctly.
if someone can fork Bitcoin and screw with your coins on the other end of the chain
Anyone can always make any altcoin. I can release a new chain tomorrow, where you will get my "athanred coins" for every successful attempt of double-spending any coins. So what? You can't stop people from making altcoins, even if they are stupid, or harmful.
this would only be a risk IF you start moving coins on the Lukecoin blockchain
If you use already splitted coins, then the risk is very low. Unless you think, that BIP-110 supporters will decide to reorg their own chain, and send their coinbase rewards to the same mining pools, which produced non-BIP-110 blocks. Because only then they could unsplit some coins: by producing a matching transaction IDs on both chains, to make the same signatures valid on both chains.