So far the younger tilt relative to what we saw in April is good news.
The counterargument to this is that the tilt is only by percentage, not actual infections. Additionally, younger people spread it quicker, increasing the chance of infection for every high-risk category, not just older people, so it may actually be worse.
The only way you can argue that younger people getting it is a good thing is if you believe there is long-term immunity once you get it. From what I've been reading, it seems the scientific community doesn't believe immunity would last longer than 2 years at most, and could run out in as soon as 3 months. Even if 900,00 people were infected every single day in the US, there would still be millions of infected people with the virus by the time the average person's immunity runs out in a year. That's where vaccines come into play, which is a different conversation. In any event, I find it hard to understand a position where any spread is good, let alone spread in a demographic which speeds up the spreading process.