Here is what I think:
The most important feature of XCurrency is privacy there is no doubt about this and getting it done is surely the number 1 priority.
Second priority is, at least in my mind, creating an environment that would enable spending XCurrency. I understand that introducing xc on the currency cards and ATMs will make it possible to spend it anywhere or exchange it for fiat, but people can do this just as well with bitcoin. For XC there needs to be a different application, specific for anon coins, like an online market.
By market I refer to a completely decentralized online market that would use xc. For such a market to have success a true anon coin is necessary and xc is perfect for that. Otherwise there are little applications that would absolutely require the use of an anon coin. I mean using it to sponsor political parties is great but still...not enough. Also what point is there to keep the records of a online company private (using xc) if the actual business can not be conducted also in a private way (using a decentralized anon market based on xc).
I consider cloak coin as the most important competitor. They are currently working on implementing a decentralized anon feature that might work out just as well as Dan's implementation. If they do achieve this then I belive in a very short time xc will be losing its advantage because cloak will also have their Onemarket service, maybe you have read their whitepaper.
I feel that in the future most commerce will move on the online medium and next logical step after getting rid of financial middlemen, and thus liberating money (as bitcoin and all the other cryptocurrencies have done), is eliminating the ecommerce middlemen (like ebay, amazon and many others).
There is a great deal of bitcoin being transactioned on the dark markets. Those users will most definitely migrate over to the first good implementation of a decentralized market as they are aware that their weak spot is the fact that the markets they transact on are centralized.
Now don't get me wrong, I do not advertise the sale of drugs, child porn, weapons and what not. All of these issues can be resolved through peer reviews or other methods. But the fact still stands: there is a need for such a free market open to anyone and sooner or later someone will make it happen. I only wish that XC will be the one.
So in conclusion I belive that developing such a application should be first priority after anonymity problem is fully done.
Who's the developer's of Cloak? Can I look up their bios or find them on Linkdin? I wasn't able to find them on the Cloak site?