I would say yes. Dell Inspiron 15 7000 is too powerful and high performance for your requirements. Surface Pro is a good and popular choice. Some manufacturers do have android(touchscreen) and ultrabook in one, so you can consider that too.
not really. So many student can afford Macbook. This means that their parents are loaded.
Since price is not of a concern, its the features which are of greater importance. Like you mentioned, long battery life is definitely a must have for students. SSD is mainly for the speed. Portability is also a major factor as seen from Macbooks and Ultrabook which students are using.
This means that the Dell Inspirion 15 7000 is definitely not the choice for regular students who dont require gaming and powerful performance. The weight should put them off since it is considerably much heavier than ultrabooks.