This has been happening for years on PS3. If it's a game you really want, it shouldn't matter if it's free at some point down the line.
You bought it because you were really looking forward to it. If it's a game you're on the fence about, by all means wait it out, but it's a little self defeating to stop buying games completely on the off chance the game comes to GwG/Plus a couple of months down the line.
But you got multiple games a month on ps3 and vita and now 2+ on ps4. That's the difference. There has been one month since ps+ started where there was nothing I didn't already have.