In house software isn't an issue: internal staff are not going to go away and use a competitor if they see a security warning. They're just going to learn to li

In house software isn't an issue: internal staff are not going to go away and use a competitor if they see a security warning. They're just going to learn to live with it. As for saying "small companies", I really don't see how this has an impact on smaller companies more than others. Certs are free, and trivial to install for any public domain (others in the comments above have mentioned valid problems with non-public domains, which remain to be solved but they are somewhat less affected by this feature anyway).