I hope Kronwall has a strong, healthy final season. He will likely retire after this season. There's no way he should be offered another contract, and he definitely won't sign with another team.
I'd consider offering Howard another short, 2-3 year contract at a slightly lesser cap hit, depending on who else is available. We're going to need a stop gap goaltender before Larsson, Petruzzelli, or Fulcher are ready to make the jump.
Nyquist should be traded at next year's deadline. He should garner a decent return. Not as high as Tatar because he'll be a pending UFA, but you'd have to think he'd get us a 2nd round pick, at minimum.
Like every free agent class, most of these players will re-up with their current clubs. The few that may become available, probably won't end up in Detroit. And honestly I'm okay with that. We need to continue to draft and develop. Just remember that the players listed were draft 2nd overall, 15th, undrafted, 9th, 3rd, 22nd, 2nd, 7th, 5th, 6th, 12th, 6th, 12th, 4th, 22nd, 216th, undrafted, 108th, 61st, 39th, 152nd, 2nd, undrafted. It's very likely we could have another very high (top 5) pick next year, and hopefully get that franchise player we so desperately need. That to go along with Larkin, Mantha, Rasmussen, Cholowski, *Bouchard*, Hronek, etc. should be a very good core of players.
I'm not sure we'll get Hughes next year, but piggy backing off my last point, I think we'll have a really good chance. We'll have a shot at the number one, and likely a top 5 pick, so regardless, we should be getting a very good player in what is expected to be another very good, top heavy draft.
I'm definitely aboard the 2019 HYPE train though. Fortunately, I don't expect this to be a long rebuild. With a bit of luck and some shrewd moves by our GM, I think we could be right back in the mix in the next 2-3 years...