Yes the ideas is in the right direction overall...
– I would though recon that the window space needed for the Message center can not be larger than those of the Guild, Trade, City Hall and Global Ranking overview Windows. But all these windows are still about 1/3 larger than the "Two Taps" only message center – that does not make a lot of sense, since properly the Message Center is the most active window at least in most of the guilds.
Also the different windows metnioned are not the same sizes which is something that in most cases would be done when adapting to mobile devices and responsive layouts. it is a field that need an overhaul.
So yea!, there is certain "Room" for Improvement of the message center.
So a
+1 From me with som adjustments