I don't think btc fork can affect btc in any way. Forking btc means they are creating a entire new altcoin and I don't think the creation of a new altcoin will affect bitcoin in any way. The developers fork bitcoin to make a coin which has better features than bitcoin with less transaction fees, faster confirmation etc. But I think all these forked coins are less decentralized than bitcoin because these forked coins have got a team behind it.
Not totally true.
Even the Bitcoin core has a team behind it and they work even harder.
When they try to add such new features by fork the blockchain creating a new alt coin, they think their coin would become the " Main BTC" because of that problem that it solves.
But for now, they do not change a thing in my opinion. If they truly want to solve a problem they have to act inside the BTC itself otherwise we continue to have such a issues.