Well one thing that has happened over the past 10 years is that Taiwan's qualitative edge over the PLA has steadily eroded with Taiwan unable to buy vital systems eg-they only have 2 combat worthy subs & no ship capable of launching vertically launched SAMs(essential if they want to have a decent chance of facing up to the 500 odd missiles China has pointed towards them) .The Chinese have heavily stocked up on next generation anti-ship missiles,AAMs etc from Russia during this period.