Tamil films are famous here mate!! There is a large fan base in here for Rajnikanth, Ajith, Vijay, Surya and Vikram..
Only a few films are dubbed in to Malayalam.. Rest we watch it in the same language..
Heck we even watch some films in Telegu even if we do not know anything what they are saying..
We know Tamil somewhat mate.. Mainly because there are lots of students going to TN for studies and we watch a lot of Tamil Movies
As far as in Kerala, people have no issues about speaking in Hindi.. But most of them do not know it..
In schools we had to learn Hindi as a third language.. First language is English and second language is Malayalam.. After tenth, we can select between Malayalam and Hindi!!
The politicians instead of shoving Hindi to the South Indians throat should have waited.. People would have been learned hindi because of bollywood influvence..