They're already in year 5 of not coming close to challenging for a playoff spot, the problem is the first 3.5 of those years were by accident
It's only natural the Sharks are as bad as they currently are, they spent over a decade mortgaging the future making win now moves and it caught up with them, the real mistakes came at the end of the competitive window when they doubled down on long term deals to aging players instead of reloading for the future, this made it so they not only lacked the picks and prospects needed to rebuild in earnest but they were also tied to boat anchor contracts that kept them from trading their veterans for those future assets at any decent value
Ironically, the one guy they cut bait with because he was "too old" was Joe Pavelski, and he's still going strong 5 years later, they decided it was smarter to invest in Evander Kane rather than keep their captain, huge mistake
The last 4 years of Doug Wilson desperately flailing to keep the ship afloat set the franchise back a decade, his moves from the summer of 2019 through his firing essentially undid all the hard work he put into building a sustainably competitive franchise
If they had just managed to win 2 more games in 2016 this would all have been seen as worth it, but they didn't, so now it's just a sad tale of what not to do when your aging core is falling apart