The original series was always comfortable to move onto new characters of focus, shedding older ones (in terms of story prominence) as it went along.
Not only does it feel natural to to me to want to see more Freeza and Broly--as the first characters Super has left both within Universe 7 and without arcs obviously completed within their prior appearances--the desire to not do so (both on the part of fans and official parties to some extent) in favor of continuing to revisit the classic core cast is what strikes me as the less-in-the-spirit-of-DB, safer fan-appeal one.
I am specifically not horribly in love with Broly, but am definitely of the opinion that new stories should be incorporating and using him, simply because he's a new character with room to grow, and those kinds of gradual changes in core cast are part of DB's ethos I've always personally enjoyed.
Personally. But yeah, get Gohan, Kuririn, Piccolo, Goten, Trunks, the androids, Yamcha, etc. out of there unless there's really a commitment to doing something new with them, and give me Freeza, Broly, Oob, Pan (pipe dream on those two probably), some of the more dynamic figures from other universes, etc. instead. DB has always had a problem using what it already has, so to speak, but it's always kind of gleefully not cared and moved onto the next thing. Of the two, if Super is going to continue into these longer-form serials reminiscent of the original run, I definitely prefer it doing the latter--even if that means letting favorites go or that the main cast at any one point may not be my favorite group of the run.
(I say this but would actually be happy to see Gohan in a prominent role again if they shake him out of his Piccolo team-ups and let him and Vegeta pair up for a change, since they also have chemistry with each other and Gohan has a little more going on than most of the other classic cast members at this point.)
