Speculations about the fractal meta
Will tanks become meta? probably not. Will it make potentially very difficult content easier? maybe.
A tank doesn’t stop your team from getting mowed down when stacking, it doesn’t let your team open field trash mobs, all a tank can effectively do is hold boss agro which is only a small portion of a fractal and people generally work around that.
Protection/weakness could be a necessity since they protect your team and other factors like potency and timing of blinds might become a “thing” but as long as their attack speed remains the same that will be the best way to deal with trash.
Chill + Projectile defenses would negate almost any need for a tank. Engi with food and scale venom covers both weakness and conditions, if the toughness gets too high you can add in more engis for more chill, blind and projectile blocks on top of their condition damage.