I think the series would be less popular. Scouters definitely are a staple item in the series even though AT abandoned power levels after about a dozen volumes. Hell, look at how they're still featured in Super while Goku's cloud and staff rarely ever are. Scouters were premium collection items alongside intricate figures and a remote shaped like the Dragon Radar for limited edition Dragon Box sets too
Freeza's most famous phrase, even moreso than "5 minutes" and "this is my 100%!" is probably his "my power level is 530,000" as well