The short answer is yes. Assuming that every of your DR procedures works well. In my experience, if you are confident with the san discs replication as the whole DR plan, its fine. But it is better to test the worst case scenario and see if the DR procedures are ok and updated.
The SAN by itself, depending on how it is configured, provides data redundancy, so it have to be a catastroph incident to make you san unavailable and you have to switch to the DR facility. In my experience the SQL server fails more often than the SAN, so it is better to have redundancy on SQL server also, perhaps a cluster. Here is when licences costs enter to stage, because it is expensive.
You have to check also, the backup/restore procedures in order to have full view of the DR plan, and I believe this is the first step on the list.
Hope this helps.