Startup Idea : Open modular messaging

Hi, i would like to build an instant messaging service. The idea is, that we create the basic functionality: - Buddylist - Messaging via XMPP (encrypted PGP or OTR) - text (+emoticons) / videos / pictures and voice - Profile - Groups and a open plugin system, so everyone can plug in the function they like (e.g. a dating plugin or a payment plugin). And the plugins get certain permissions (which the user has to opt-in). (Maybe add an Verification-Process for Dating or so). We only build the Basic-infrastructure app. XMPP Servers and Plugins build by Third-Party. Like to hear your opinion