Hm... I wonder how much toy sales Golden Cooler made and such. If Cooler's remained a decently profitable character in other lines like that in general, wouldn't be reaching that much to say they might find him worth re-exploring for a movie or something at some point.
And it's not like Piccolo and Pikkon getting attention has to be mutually exclusive, similar as they are. If I had to choose though, would say focus on making Piccolo able to do more in the story again on occasion over bringing Pikkon pack, much as I liked Pikkon as a breath of fresh air in between the Cell and Buu arcs... Mostly comes down to Piccolo having some of the coolest techniques IMO, nice as some of Pikkon's were (thunder flash attaaack!). And even if Pikkon did come back, we wouldn't hear his rad Bruce Faulconer score again, outside of fan videos I guess.
The only Cell Dorado that should be canonized is the one with g-spots, Damborg.