J.K.
HI B.,
I think if you're happy with your caregivers and he's happy there you should keep him there... UNLESS you feel like part of his love for the daycare environment is that there are other kids there stimulating him and that he has bonded to. At a year old kids don't necessarily PLAY with other kids, but they are getting valuable skills from being around other kids and they do like being around other kids. But if you have play groups or friends and family that you are around often so he gets that kid exposure, I'd leave him where he is.
From my own experience I see that by age 2 kids are really needing to be with other kids and by age 3 they need to be with kids that are their own age (primarily). In terms of his age now, you have some time to find another place when the time is right for you and for him.
Good luck! Good childcare is tough to find!