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The problem is there's simply too many pokemon.They have to keep making new abilities and moves and types and changing type effectiveness to accommodate additions and the more they make more will fall short of the competitively viable mark.
The challenge comes with finding a team that can overcome the top tier teams but eventually there will come a time when it's the best of the best vs themselves because there are simply no other options. I'm not saying it's already there but when maybe 7 of the 70ish new pokemon are even remotely considerable without a successful reboot like BW attempted (emphasis on attempted) a crash isn't too far away. If Gen 1-4 pokemon weren't available to 5 the restart would have been more successful but we can only hope gen 7 gets it right