As per the ICC meeting in Dubai, the 2019 and 2023 World Cup will be a 10 Nations tournament. However the 10 Full Members do not get an Automatic Entry as was the plan made for 2015 WC. The top 8 teams as per the ICC ranking get an direct entry, and the rest 2 teams will come through the qualifiers. Hence now the likes of BD, Zim and even to some extent WI cannot rest easily.
The good news is from 2014 onwards the World T20 will be back to 16 nations. Like the qualifier for 2012 World T20 had 16 Nations, the tournament in same format will be held every 2 years before the World T20.
I think ICC has got it right for the World T20. For the ODI Cup, though the format will make it interesting, however I would have loved to see at least 12 nations playing in it.The Full members like BD & Zim get a part of FTP and would keep improving while the likes of Ireland and Afghanistan will be devoid of the exposure and will have the Kenya story and thus the gap in ODI's between Full Members and Associates would decrease.
The ICC should accommodate the top 6 Associate as part of FTP getting them atleast 10 ODI against full members and 1 or 2 First Class Games each year if Cricket really needs to expand