Would you stay or would you go?

I am currently a childminder, running a very successful business. However I have been offered a premises in which to open a nursery. I am quite keen to do this however I am nervous about leaving a successful business to go into the unknown. I'm wondering how many of you out there would stay with your childminder in moving to the nursery with her or how many would look elsewhere for a different childminder? I understand people choose a childminder over a nursery for several reasons and vice versa, it's whether it's me they like or my setting lol. It's really hard to know what to do, I don't feel I can ask the parents direct yet as it's very early days and I don't want them to get nervous and move on if I decide not to go ahead. Any thoughts?