Considering the apparent serious implementation and backing behind the sidechain, the market starts using it and finds considerable value in it. price of BTC goes UP
why would price do this?
People find value in the ability to make anonymous transactions. Buy BTC to use particular sidechain. Price of BTC goes up
ah, but in your world it's not possible for a sidescam to cause the price of BTC to go down?
No.
Is the price of BTC going down because of altscams? In fact, a successful sidescam might push BTC's value up since it would essentially increase the scarcity of the remaining coins.