Will Enchanter Mana Sieving be a Thing on Raids?

[commongood]

So while I know it's possibly a long while into the future, the devs have mentioned that one of the things next in the pipeline for P99 is to fix pushback as spell interrupting.

From what I understand this has pretty huge ramifications on raids as it means any raidboss that currently casts Cheal or worse, gates, can no longer be pushed to interrupt that.

So two immediate options spring to mind. One is to fight mobs where they spawn. The other is to drain their mana making them oom before they hit 40% hp.

Will that mean suddenly needing a bunch of chanters on raids where before you basically just needed buffs and tash and maybe dispell covered on most fights?

How many chanters spamming Mana Sieve will it take to run your average NToV dragon out of mana?