FFE and the Roach All-In

I've come across a dilemna regarding the Protoss FFE - at the time you decide to all-in, you cannot tell if they are going double Stargate (your Overlord won't be there in time).  If you try to Roach-Ling all-in the Stargate build, you will lose, because you won't have enough to stop that many Void Rays (even multiple Queens die too fast to that many Voids).  Even if you do a lot of economic damage and balance the scales, 5-6 Voids will take your base apart.  Throwing up a ton of Spores doesn't work because they can simply avoid them or pick off buildings outside your Spore Coverage.  Your only way out is to build Hydras, which requires a Lair, which you won't have if you tried a Roach attack.

I suspect Protoss players are gravitating towards this build because it forces Hydras, which are slow, cannot counterattack worth crap, and are vulnerable to Zealots (which Protoss can make after spending all their gas on Void Rays).

Time to give up the Roach-Ling all-ins...