I agree its a wave whatever prefix you attach to it.
But, we will see further waves.....if as Tuba437 suggests a vaccine beating variant rocks up we will see a wave.
If as Quartz2208 suggests we see local or regional clusters (of any existing or new variant) as long as we collect, collate and report at a national level we have a wave.
Unless a wave isn't an uptick in cases and attendant fall. Perhaps my understanding is incorrect.
But I do think it remains true that without significant controls there is no exit, because people appear to have limited immunity over time especially to new variants, and a new variant will have an advantage over other variants if it can side step existing vaccines. So at some point we will read the lines '4th wave' long before we read 'outbreak'
Added to this is that these waves are entirely engineered by human intervention and behaviour. We can control the rate at which it infects, and therefore to a lesser extent the rate at which it mutates, and to a lesser extent how by giving the virus less vectors due to our behaviour. There is no wave that we can analyse to understand the behaviour of the virus that is independent of our intervention.
My other concern is this, if at the end of this wave (assuming 'exit refers to end of control measures) we retrospectively look at the number of excess deaths from covid resulting from cessation of control measures, (excess being the difference between death rate in the lead up to the 19th and the rates from the 19th to the natural end of the wave, assuming there is an end into which we haven't intervened with control measures) then it could be said that number of deaths was avoidable. But even more so when in 6 weeks or 8 weeks time Bojo and co panic and run out front to send us back to our houses. And they will thus making a mockery of 'exit' and having created the conditions underwhich the avoidable deaths occurred.
If for whatever reason at the start I had been told "take responsibility for yourself" and "no societal wide control measures would be taken, and no reason believe they should be or that no measures controlling human behaviour or social contact will ultimately save you or any other life" I wouldn't now be asking about whether its ok to ignore preventable deaths (note i'm not asking how many deaths are acceptable). Its a moral question about life itself. If a death is preventable should we do whatever we can to preserve that life?
There is no such thing as an acceptable number of deaths when we can prevent those deaths.