With 5 asics appearing so far this year to take down 5 gpu coins, it seems they can create a new asic every 30 days now. Thus, it is possible that 90+% of future coins are asic coins.
That's not true. They can release a new ASIC every month only because they started developing them last year. A new algo is safe from ASIC for 6-8 months. Some coins (Monero IIRC) have plans to fork every 6 months. Just the threat of that is enough to deter ASIC development for that algo.