MD4 and MD5 didn't get easier and easier to crack due to cryptanalytic advances; it got easier to generate collisions. That's a serious problem for a cryptographic hash, but depending on the construction you're using, it might not have anything to do with MD5's suitability as a password hash. There's no password hash cracking tool I'm aware of that takes advantage of MD5's weaknesses.

So, no: this isn't happening with bcrypt.