Is MUC obsolete?

We think that MIX is the way forward, but we also know that this won’t happen overnight. Because of that MUC is still supported in all our applications and Tigase XMPP Server implements XEP-0408: Mediated Information eXchange (MIX): Co-existence with MUC to allow all non-MIX client to participate in MIX channel discussions using MUC protocol.