I don't know, but maybe Template Engine is something like Office Software... before OpenOffice we had a lot initiatives in developing word processors and spreadsheet software, but after that there are just OpenOffice and some few-featured word processors... It's hard to think about creating a new Word Processor from scratch...

Maybe Templating systems reached the same state of art, we have Template::Toolkit as the full-featured-all-included suite for template management and some few-featured Template Processors like HTML::Template or Text::Template... In fact, if someone considers starting a new Template processing engine from scratch nowadays, this one would give a lot of work for a psicologyst...