I'd heard about Sia coin, though I haven't looked into it yet. Didn't realize it was currently being pc-mined. That seems like the way to go for mining now: find new alts to mine at a reasonable profit then sell (or hold if you believe in it). I think it makes the mining infrastructure slightly less robust since once it become unprofitable people will just move on, but I also feel like many alts will have trouble surviving longer term anyway.