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It's well beyond discussion. Blocknet, the first decentralized exchange, is in testnet and expected to go live in a few weeks.
However, Blocknet DEX compatible coins will need to be BIP65. I'm not sure if Slimcoin has BIP65 or what would be involved in upgrading Slimcoin to the standard.
Sorry to sound ignorant, but when this decentralized exchange thing is done a coin's website can link to what to enable people to buy?
A person goes to
http://slimco.in/ or
http://www.slimcoin.club/ or wherever and there is a page called "Buy Decentrally".
Where does that page lead?
In the soon-to-be-released version, it's my understanding that you would install Blocknet's decentralized exchange on a computer that has wallets running of the coins you plan to trade. In the next version, you won't have to download the blockchains of any coins and there will be a mobile app for it.