jump up or crash, why is that?

I don't think so because people don't have much confidence on this Bitcoin Cash. Many people are dumping in the market for free money.
It will take some time to reach its price more than what we expected

I think all cryto has their own agenda. Bcash is not going to the the last Bitcoin splits. There are many more to come. Free money for Bitcoin holders.

The price development of BCH is insanely difficult to assess. I mean, it is even difficult for Bitcoin itself, but for an asset that is forked from another hard to be assessed asset, it will take quite some time.

At current market cap of over $4 bil this is still vastly overpriced. One of the main drivers of the BTC price are the alt pairs and the fact that everybody is accustomed to nominate their alts in BTC. BCC lost the war by having another ticker and being labeled as an alt from the start.

Kraken Enables Bitcoin Cash (BCH) Deposits and Withdrawals

http://blog.kraken.com/post/1191/kraken-enables-bitcoin-cash-bch-deposits-and-withdrawals/
Quelle
https://twitter.com/krakenfx/status/894577965861699584

BCC didn't lose anything, actually BitConnect (BCC) is the big winner as some people thought this is Bitcoin Cash (BCH)

And what else should the fork be than another alt-coin like several other Bitcoin clones? There is just one Bitcoin (BTC) and everything else is an alt-coin.

There are something like 10 or more Bitcoin clones as alt-coins available, BCH is just another one with a massive airdrop during it's ICO but also another one with no real-world value behind.

I am mining Bitcoin Cash because I have Fear of Missing Out.  While everybody is selling ... I know it's not a popular idea, but this thing may work out.  Remember, very few people know about bitcoin.  We saw slight interest in Bitcoin - for the first time - from some institutions and the backlog created $100 tx fees.  The next time this happens, people may want to use this upgraded version.  The fact that everybody is running away makes me think perhaps it was irrational fear.

One thing is for sure.  This is going to really compress the timelines to make Segregated Witness and mesh networking fully functional.  But what happens if all the mining power leaves once the fees go to "brokerage channels"?  Bitcoin SW could experience very long block times ...

It's speculation, but I think this may be on to something over the next couple years.  I HODL'd all of my virgin BCH and am putting a little hash power to ViaBTC both as a hedge and because I am tired of this "unknown" entity mining all of the blocks.

Right this second according to coin dance bitcoin cash is actually more profitable to mine  

I don't expect it to and hope it don't last

Also that unknown pool is most certainly antpool bitmain expressed huge support for this but nowhere to bee seen but their share on the original chain has dropped so put 2 n 2 together