my answer is Yes, why not?
T3 is stable, advanced, secure and well maintained.
Howewer, when the framework is updated, you must check if your template works fine or not. If not you have to provide template updating for the templates.
Remember that from 3.5 version T3 framework will be included in Joomla official package and then updated with Joomla update function.
In every case the dev team of T3 always try the best to make backward compatible as much as possible.