afraid of portupgrade -ra

I have not done a cvsup and buildworld since the threading move in the ports
tree was made.  Is it okay for me to do a cvsup and buildworld WITHOUT doing
a portupgrade -ra?  Will I break any of my existing applications?  The
reason I ask is because on my laptop, I've installed a lot of ports... as in
somewhere around 6500.  While I typically install only what I need, my
philosophy with my laptop was that I also typically end up in situations
where I'll need something and not have the connectivity to download a
package or grab the ports source to compile.  So now I'm faced with having
my machine crunch through quite a few ports... not all of which I'm
confident will build correctly.


--
/*===================[ Jake Khuon <khuon_at_NEEBU.Net> ]======================+
 | Packet Plumber, Network Engineers     /| / [~ [~ |) | | --------------- |
 | for Effective Bandwidth Utilisation  / |/  [_ [_ |) |_| N E T W O R K S |
 +=========================================================================*/