I doubt your're too late, so long as you're willing to hodl for a while. It likely won't blast through the billion dollar ceiling like a lot of the newer hyped coins have been moving towards lately. However, the energy required for PoW is wasteful and allows control to accumulate (to a degree) where electricity is cheaper, and so the market still needs a dominant PoS privacy coin. PIVX is great, but the opt in privacy will always keep it from reaching Monero's level of appeal.