[CentOS] Upgrade centos 6 to 7

I read at
<http://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool>

"Warning: use of this tool is currently not recommended 
as several system-critical packages are of a higher version number 
in CentOS 6.6 than they are in CentOS 7 
so those do not get upgraded correctly. 
This renders yum and several other system tools non-functional."

Is that still the position?
If so, is it likely to change in the near future?

-- 
Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin