I find the whole situation disappointing, and we'll probably never actually know what exactly was going on in the locker room and how much it needed to be done. I think the team today is a safer bet for moderate success, while the team we started yesterday had a better chance for legit Cup contention if you could get everything to click.
At the end of the day though, while Miller and Pettersson are both centers who've had 100 point seasons, they've never been able to click at the same time on separate lines. One of the two were always either injured or struggling, and in the case of this season both at the same time. Like today's lineup having just Pettersson without Miller looks weaker on paper, last season for the second half and into the playoffs our 2nd line was effectively Joshua-Blueger/Lindholm-Garland. It's really no different today if things go well, with potential a legit top line, two good 'middle-six' type lines like the above, a good 4th line, but all backed by a much stronger blueline.
Next step of course, Boeser aside, is what to do with all our new cap space. This will really determine whether we come out stronger or weaker as a contender from what we had last season. The problem isn't so much 'value' though as it is unpredictability, as you never know who will come available and when. I'd say the worst thing we could do is pull a Detroit and just sign whatever middling UFA's happen to be available like Compher and Copp.