Answer to the OP
What seems to be the main problems?
Our problems are man-made and an extension of trying to extend our playoff streak, we lack high end prospect talent. Our first top 15 pick in 25 years was Michael Rasmussen, who is a fine prospect but not the elite prospect fans were going for with our first top ten pick.
Are they an easy fix or is it more then that?
The "easy fix" is a true rebuild, we need young, elite talent.
Also on the bright side- who is looking good for the future?
Cholowski, Hronek are top 4 players, 1 of whom can seemingly pair with that Elite D man we need on the top pair. Luckily, Cholo is proving to people, as a 20 year old, he has had stones to be a real player in this league.
Zadina is a great prospect, though he hasn't flashed the NHL ability of a Brady Tkachuk yet, he has plenty of growth. Won't be the first time an elite prospect didn't show his greatness before making the show. I will say, I was a big Brady Tkachuk guy, and I would've been really okay with drafting him. I'm not surprised with what he's shown me at this level.
Any promising prospects?
Outside of the top dogs, I'd say Givani Smith is a legit nhler. People may point to his "production" in his first few games in the ahl a point total standpoint, but I've watched 3 of those games... And the dude just gets it. He's not a top 6 talent, but he's the type of player that people dig.
Jared McIssac has top 4 potential. Nothing to add specifically, but he is a legit nhl prospect.
Gustav Lindstrom is a guy that no one will ever talk about, but dude has real poise and calmness about him and a solid defensive game to match. He's not going to put up 50 points, but he has top 4 potential too.
Jonatan Berggren is a creative, skilled kid playing in the SHL, he's learning to play against men but his creativity never lacks. Exciting young top 6 prospect.
Joe Veleno is a player. The questions about his shot are dwindling quickly. Creative, assertive, and smart, just a pure nhl prospect, kid is a definite 2 or 3 C in my mind.
There's some goalie prospects, but Filip Larsson has been riddled with injuries that makes his stellar play concerning. Same with E Svechnikov, I love the kid but his inopportune injuries just make you feel bad for him as a fan.