I said other because I think it totally depends on the individual child and how it is working for all involved. I bedshared with my oldest two until they were 4 & 2 and I was pregnant with number 3 and they got new beds and the transition went pretty smoothly. I can't remember when dd2 left our bed. DD3 just turned 3 and kind of goes back and forth between her bed and ours. DD4 is 10 months old and in no hurry to go anywhere. All of them still occasionally sleep with us when they are sick or scared or whatever...The morning after dh's dad died, all seven us slept in our king bed.
Could you put the toddler bed in your room and either start him in it and allow him back in bed when he wakes or start him in your bed and move him when he goes to sleep? That might make the transition a bit easier.
I guess it would totally depend on how much he is still nightnursing too.