I believe the trial has shown conclusively that it is both possible and desirable to use Python as the principal teaching language:
Python should be used as the first year teaching language. If used it will be possible to teach students more programming and less of the peculiarities of a particular language. Teaching a mid-level language like C in just one day is inadvisable. Too much time must be spent teaching C and not enough time teaching generic skills to students with no programming experience.
The use of Python as the first year language is not a dead-end. I have tried to emphasise that Python allows the teaching of widely applicable programming concepts. Its use in no way precludes the use of C in a more advanced course. In fact students who go on to use C in later years will have a better grounding in concepts from their introduction to programming than they might have from a C-based introduction. I believe that more students will go on to advanced programming if introduced using Python because introducing programming using C will frustrate and scare off a large number of students.
In conclusion, Python offers the optimum compromise of teachability and applicability.