I dont believe there is still people trying to do their own PHP Templating Engine, its amazing. We have already 100+, mostly half-solutions. Some months ago there was lots of discussions because someone wanted to put another Templating Engine in PEAR (a 'standard' library for PHP) besides the 4 already existent.
There is a pearl of wisdom i have read somewhere (certainly a book on philosophy/history of physics, but i cant remember which one) which i think applies perfectly to this:
If a question raises too much debate, it is a signal that it is the wrong question.
Meaning: people are building solutions (Templating Engines) to the wrong problem, that's why they never agree what's the best way to do it.