It's April, writing off Upton and Cozart is premature. Trout, Ohtani, Simmons, Cozart, Upton should all finish with above average wRC+ and WAR.
Have you watched or paid close attention to any of Ohtani's appearances? He's been amazing with the bat and almost as good as advertised pitching. Unless his arm blows up he's going to put up a minimum of 6 WAR.
You keep saying the overworked bullpen is going to cost them late in the season as if bullpens are a set 7 or 8 people. They will end up cycling relievers from the minors and waiver claims just like every team does every year.
As various starters return from injury, their pitching should end up a strength. They will probally be buyers at the deadline, when they can add pitching and anything else they need.
I don't think that they are one of the elite teams, but I do think they have a good chance at making the playoffs at which point anything can happen.
You have a point about wasting Trout's career to date, but you're completely wrong that they should be blowing it up. IMO they had the best offseason improvement of any team.