And why is the hard fork may I ask? For the block size increase? Nobody will support that thing. If a hard fork happens to create a bigger block bitcoin, it will be an altcoin. They better start a new alt with the desired specs instead. They may even premine it till they
Not if all the miners are forced over to SegWit2x weeks ahead of the planned hard fork so that when the hard fork happens those who are on the original client get stalled where it takes all day to find a block with just a hand full of miners being on the old chain. That's why I think if SegWit2x happens we'll eventually end up with two separate chains, and it'll take some time for people to start mining the old chain again. Oh and the possibility exists for the forces behind SegWit2x to sabotage the old chain easily since almost all mining power will have left the chain a 51% attack will be very easy. They just need to sabotage it for a while until everyone updates their clients to SegWit2x.
Unfortunately if you control 51% of mining power you can freeze the network and have a lot of power over it. It's been talked about since the beginning and now it may be happening for real.