How is this different to the completely decentralised trading inside Qora? Sure not alt to alt but Qora to assets including fiat etc.
Can Qora still act independently it's exchange?
Is it reversible, ie can we leave later of we want.
Qora does have plans to do alt to alt trading I thought but admits it's never been doe and could be tough or even impossible?
Yes, you can back out of this. Certain layers to these decentralized services are still being developed, but the end-goal is to have a way for people to create a deposit address for one coin (Qora, from my last example) and then set a payment address (DOGE) and then set the trade price. This is just like any exchange, except through the use of multisig addresses, it's semi-decentralized. If you want to cancel YOUR QORA->DOGE order, before it is filled, you can and you will get back your QORA.
Can these services be built on top of QORA, once the asset exchange is up? Certainly! However, Nxt has a huge head start and has an agressive dev team, and community of supported services.
Again, can Qora compete? Yes, and it should. But don't be naive and think that we're near catching up.
Right now these Nxt Services are mostly developed by JL777 and the run on top of Nxt. If Qora and an extra dev, or two, integrated all of these services into the client/server code, and made it easy for anyone to run their own multisig gateway, Qora could (and should!) get a ton of attention.
I understand the possible technical services after your comment but in response to "What's the point of being linked together" mentioned by rabbiter, I have to add that I think there is much more to the supernet financially speaking that has not been mentioned.
The bigger vision seems to be about bringing more fiat/new investors into the crypto space, raising the market caps for BTCD, the SN coins (so far NXT and BBR, a dark coin) and first and foremost believe it or not, BTC market cap. This will overall bring in more users, fiat and raise market caps for other coins. The anonymity feature, teleporting, (in addition to the numerous others mentioned) is critical for this, as certain human circles can only bring in fiat if the crypto is supporting dark. So with increased influx of fiat, all win. The big win here is that BTCD (the center of the SN) can darken BTC.
Regarding "why bring these SN core coins together" apart from the features? This may be off the wall, but I suspect this is the beginning of a new type of movement: there are good coins with lots of tech and original code (Qora, BTC, NXT, a handful of others) and there are useful coins/forks that have original features or new algos and there are clones and other coins that are being made as a high school science project that add no value to the space except to the schoolboy's technical ability. The SN will raise a LOT of capital. Apparently 90% of this capital will be used to buy stakes from core coins (less than 10% stakes apparently), immediately doubling or tripling or more their market caps. This is in addition to the feature integrations mentioned. I suspect some of the capital will be used to invest (pump) other coins that may not be part of the core but will increase holdings. So if all goes to plan, in the short term, huge financial gains and exposure. In the long term, survival through major adoption and sustained usage.
...Qora will be strong in the long run with or without the SN, but with the SN Qora could quickly adopt to the rapidly changing landscape of winners (with massive market cap) and those coins struggling to attract attention and reach $1M market cap.
Of course, all of this talk is nothing if Qora is not willing to apply. Only Qora knows the code and can see the technical benefits, drawbacks and possibilities of joining forces. An an investor and crypto speculator, I hope Qora will join this discussion.
Note: I have skin in the SN game. I own BTCD, BBR and NXT (and an original Qora stakeholder) so I have interest in the SN even if Qora decides against it.