i don’t think that is a bad idea. The thing about being a bunny owner, is that you realize everything out there is cats and dogs.
This can be both good and bad. If you provide a service for a small, but passionate group of individuals, in this case bunny owners, you can easy carve out of section of business for yourself. This means that you can get the lion’s share of the business and if you do a good job, word of mouth will spread. However, the down side of this is that unlike cats and dogs, there is a small group. If you are in an area where there is not a lot of bunny owners, then the business may struggle.
This is why exotic pet vets are more expensive right? They have to spend extra time and money to go to school. when the graduate, they possess a specialty and since there is not a lot of exotic vets out there, they charge more.
So I think it is a viable business but you should definitely look into it and research before you make a move.
Also, I think another thing to consider is to find people that will be savvy in caring and handling the rabbits. Again, probably not a hard thing to do or train, but something to consider if you do decide to be serious about it. Good luck