It would appear that wizards is loving on mill lately as yet another playable mill card has been printed and, as after every new good mill card is printed, I'm here to ask whether or not we have yet reached that critical density of good mill spells to allow it to become at least a tier 2 deck type in legacy.

To date for playable mill we have:
1cc:
Tome Scour
Memory Sluice
Extirpate(kinda)
Vision Charm

2cc:
Glimpse the Unthinkable
Brain Freeze(if you cast 1+ other spell it becomes good)

3cc:
Mind Funeral
Jace Beleren

4cc:
none yet

5cc:
Archive Trap
Haunting Echoes

I think that about covers the decent ones. That being said, while the deck isn't near as efficient as burn yet, it also has access to better support such as Force, Dark Confi, Phyrexian Arena and such goodies. Also, the fact that your opponent draws 1 a turn also helps.

Since I'll get a bitching at if I don't heres a list for reference:

4 Vision Charm
4 Tome Scour
4 Extirpate
4 Glimpse the Unthinkable
4 Brain Freeze
4 Phyrexian Arena
4 Mind Funeral
4 Jace Beleren
3 Archive Trap
3 Haunting Echoes
22 Lands

So, does mill have what it takes to enter at least mediocre deck status? Discuss.