Would most people say it's reasonable?
I'd say so. When the two weeks was originally mentioned, which somehow then got transplanted into 'they want to lockdown forever' it was to ensure we had enough data to make the right decision.
The issue highlighted was that initially there were low numbers with the delta variant, low numbers mean any modelling or prediction has a high degree of uncertainty. But we have seen an exponential increase in cases which we know from past waves is the first sign of a looming problem.
Cases didn't start to jump until last Wednesday when we went over 4K, then over 5K on Thursday and over 6K on Friday. Given the lag between cases and hospitalisation it could be the end of this week or start of next week before any increase in hospitalisations is seen.
By the time you've then gathered data on the immunisation status of those hospitalised and also if the hospitalisations are short stays and released or long term potentially leading to death you're past the 21st. What we don't want to do is open up and then a week later realise its a mistake. The early indicators are we're good to go but after all this time lets make sure we get it right and don't end up back in lockdown.