/etc/profile could use modernisation
In particular, /usr/sbin/quota gets called by default, which on a system with many ZFS filesystems delays the login quite considerably with potentially a very large amount of this type of thing:
On this particular box it adds an additional 5-10 seconds to the login time.
On systems where ZFS is misbehaving (such as if an iSCSI mount has gone away) it can prevent logging in at all (workaround: ssh -t).
Quotas are usually implemented in mutli-user environments such as Universities or corporate desktop environments, however I imagine the vast majority of OI installs are single user or on servers, where user-level quotas aren't implemented. Where quotas are used, they'll be with ZFS for shares.
So I am proposing we comment out /usr/sbin/quota (or in some way disable it by default). We should cater for the majority rather than a minority who can easily re-add it if desired.
Also the following looks a little bit dated to me:
if [ "$TERM" = "" ] then if /bin/i386 then TERM=sun-color else TERM=sun fi export TERM fi
The top of the file could also be revamped with the new CDDL.