I have been positively surprised by the current usage limits on the Max 5x plan.

I think it might even be suitable for full time work, if the $200 plan gives four times the usage.

Particularly if they also remove the halving in the future.

I am not holding my breath for them adding an even more subsidized subscription tier.

Don't assume the current subscription tiers are subsidized. We don't know, and it's entirely possible that even the $200 a month plan is not. Remember that Anthropic makes improvements to their models to use fewer tokens all the time, and we don't know how much they pass that on to us. "Usage" is not one-to-one with tokens, either.