There's a new post on Lukas Smith's blog where he talks about frameworks, phpBB's decision and building "gold on top of crap".

See the various symfony CMS solutions are an example of how wrong things can go. We now have several solutions whose architectural differences are either cosmetic or simply bad design decisions probably a result of trying to invent things in the small ecosystem of a company project team. So I was very happy to hear then that phpBB will adopt Symfony 2 for their next version. Hopefully this will become a role model for others.

He talks about how several of the popular CMS systems these days have worked harder on their external functionality than on the base (where they need the most work). He also looks towards a future where there are good, solid CMS solutions and leaders will emerge from the pack and provide quality content management for the PHP masses.

There's also some great discussion in the comments of the post with people who both share and disagree with some of Lukas' thoughts.