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There is not an exact date, since they must to be 100% sure that DeepSend works well. If you ask me I think it will be released at the end of the year (maybe November or before) but itīs just my guess.
Everything can be, there are no guarantees. But there is a concern that if the expected rise of altcoins will happen before the release of DeepSend, this rise will happen without Onion. It will be a disappointment...
Well, I don't think the rise of altcoins will happen before 2020 at this point. Remember, BTC bull run comes before altcoin market bull run, as it has been demonstrated in the past. Even if that were to happen before the release of DeepSend, however, I think that DeepOnion has much to offer beyond DeepSend. VoteCentral is up and running more than a year now, there are ecommerce plugins to be used as DeepOnion payment options, etc. Not to mention that the news from Europe makes me believe that they're trying to make any cryptocurrencies that aren't issued by governments obsolete, especially ever since they noticed the intentions of Facebook, which means that more regulations are probably coming and the only coins that will remain unaffected are the ones that have the ability to hide the user's activity, as privacy coins do.
I think the altcoins will have a chance to rise and hit bull run soon. I cannot give an exact time but I think bull run will happen.