With another reliable 5c-card available, I am wondering if we have reached a critical point where it is possible to design a potent multicolor deck.

Here's a look at some of the cards available to us now:

5-color manabase
Pillar of the Paruns
City of Brass
Mana Confluence
Reflecting Pool
Vesuva

Cheap Wish for all sorts of spells
Glittering Wish

1 CC Multicolor spells
Deathrite Shaman
Dryad Militant
Figure of Destiny
Guttural Response
Judge’s Familiar
Nivmagus Elemental

Every weird combination of off-color multicolor spells become available. From Naya Hushblade, Vindicate, Detention Sphere, Geist of Saint Traft, Gaddock Teeg, Knight of the Reliquary, Doran, the Siege Tower, Pernicious Deed, Bloodbraid Elf, Baleful Strix, Shardless Agent, Gerrard's Verdict, Tidehollow Sculler, Golgari Charm, Abrupt Decay, and even some subpar counters Countersquall

Absorb, Counterflux, and many more.

What do you think? Have we reached a point where a 5 color deck can exist, or are the drawbacks of the mana base still too big?