I don't think it would be that bad news if there are that many bots as it would mean there is so much more room for new real players to come in. I do have a hard time to see Splinterlands reach a daily active players base of over 1M Players though.

For as far as DEC goes, I guess they want it to go back to the 1000 DEC = 1$ peg as they will double the reward pool. At some point I also wouldn't be surprised if the capped the supply and used earnings they have in from the game to actually buy back DEC to put it in the reward pool. You can't just continue printing assets out of nowhere forever and that right now is their main playbook as seen with the riftwatcher and the waka card.