I am seriously considering moving some of my clients websites to a multisite installation. I have tried it, tested and it would make my life easier and convenient I think. However, I will be creating a network of around 15 sites and I will be using 15 different themes on the multisite installation.
However (and I cannot find an answer about this), if a new update of WordPress becomes available, I guess I need to ensure that all my themes on the network are compatible with the WordPress update before upgrading. Does it mean that if you have a network with 50 sites with different themes each but only one of your subsites themes are not compatible with the new version of WordPress, you would not be able to update your wordpress network installation because of just one site?
Could anyone provide some insights on this?
Thanks a lot.