It is still competitive but has improved drastically and continues to do so. Currently quiet a few neurologists in training. But now neurologists also have a voice with more and more clinical trials in stroke, carotid stenosis and intracranial stenosis. And now clinical trials have begun in Brazil, UK, Spain and a few other nations in intraarterial delivery of stem cells in ICA/MCA infarcts. Hopefully it will initiate in the US as well. Look at clinicaltrials.gov
This is the best time for neurology origin interventionalists to enter the field.
Neurosurgery will also provide interventionalists, but they would also be extremely occupied with the OR schedule. If you read my previous posts, nsurg also has several emerging subspecialities. In the evolving healthcare scene, there are 'neurosciences centers' as at some major centers, where there are neurointerventionalists from the 3 specialities (nrad, nsurg, stroke/NICU) that share endovasc work and calls and also practice their original speciality. In reality there is and will continue to be a lot of work with more innovations in ESN. Nanotechnology is also perceived as the next frontier in intervention.