Hard to say. Codex says I've made some 500+ million credits from mining. This was exclusively done in a Cutter, laser mining for Platinum. I just know it took a serious effort and a lot longer than an hour or so to fill up a Cutter. And yes, this was done in pristine rings using hotspots, prospecting like a madman, using tons of limpets etc etc.
For me it's not about the credits but the sheer boredom of it. But I do believe the mining nerf was excessive because core mining was beaten to a pulp. Laser mining takes the least skill, least equipment, doesn't require precise positioning etc etc - and yet it's the credit king. Something is wrong with that imo.
Well, if mining is boring for you, don't do it then. Do something you do enjoy and stop worrying about how much or how little others who do enjoy mining earn from it.
I was doing mining when it paid peanuts and enjoyed it. The massive increased in payouts that happened turned me off mining a bit, because everyone was banging on about how awesome it was, when for years the consensus had been it was rubbish because of low payouts.
Either you enjoy doing something or you don't. The credits may determine whether you consider it profitable and worth your time, but that doesn't mean the activity itself is any better or worse.
Still, haven't done mining in a good while, but just because i've done so much of it over the years. I'm more into combat at the moment, time to finally get Elite in Combat i think and try out some new builds. Its a good time for it because bounties are paying well, so nice timing on that.
PS: I do agree core mining should reward better than laser mining.