Bitcoin price it's already dropping slowly, I don't think it will drop a few days before the fork, in fact it might even go up a bit and I also don't think other cryptos will benefit if bitcoin splits.
Not a slowly decreasing it is just a normal that we are seeing the priced down and its not a bing drop honestly its just a small drop and i think it is because of other people who bought bitcoin with less price they already sold their bitcoin just to save their profit and use them to scale up again if the price of bitcoin was drop to what they expecting ..
I feel that the price of bitcoin can be burst increase before and after the fork. since we already experience and see the success happen after the fork ..
It is too early to give you my thoughts, but of course i will keep holding my bitcoins, i want to receive the free coins, and i will do the same as before, i will sell the forked coins in order to buy more altcoins, or just withdrawing it, because it is free money. Anyway, there are more than 2 months left, so i dont know yet, maybe i change my mind in some weeks, i dont know.
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What free coins will be given in next fork?
New forked coin. i dont know what its name is or will be.
I think it will be nearly name of bitcoin again like bitcoin cash.. I was thinking that the name could be bitcoin token or bitcoin dump.

We don't know actually what will be the name but i still don't seen any news that there will be fork will be happen soon..
MAybe FCoin...BTC is holding steady and for now it doens´t seem that this forks are imediate threats to BTC value. of course no one nows the future and maybe one of this forks become better than BTC itself. Not for no IMO