[development] The future of OO and Drupal?

My apologies if this has already been covered at length elsewhere, but given that PHP 5 will be the minimum required version for Drupal - what effect will that have on Drupal's code base from this point forward? Are current 'leading' discussions indicating that over time large parts of Drupal will be written/re-written in a totally OO way? I ask because I'm wondering if a fully OO contrib module for Drupal 6 would be considered as having been 'correctly' done in a 'Drupal-way', or not. (all other things being correct/equal, of course)