Both diagnostic and interventional radiology are great fields of medicine if you have a realistic idea of what they entail. The fields actually involve some effort, which confused and embittered some trainees. Cuts in some key reimbursement -- which happened a while ago -- brought salaries down from outrageous to average, which embittered just about everyone in the field.
Radiology is not going to be outsourced. If anything, the trend is going the other way.
No computer is going to figure out how to reliably read images in our lifetime, etc.
Radiology's future is complex. It is involved in many different technologies and many different aspects of health care. The economic future of Rads will track along with the market for healthcare in general. The trend has been toward more involvement in patient care and more specialization, which requires more effort. Older rads, in particular, resist this. The trend has also been toward decreased reimbursements and increasing bureaucracy, similar to healthcare in general.
I would encourage anyone to try rads out as a med student and see if it is a good fit as a discipline. It was a good fit for me.