Where do you get this idea about San Jose losing money, and where do you have documented (not some estimate) evidence of teams losing money (an income statement, a P&L statement)? Not that it matters but Forbes does NOT have access to any NHL financials and their team valuations is slightly more accurate than sitting around at a bar over a few scotches writing franchise values on a cocktail napkin (the value of something is what someone is willing to pay for it).
Understand that, for salary cap purposes the Sharks make money. However, for San Jose Sharks, LP there are dozens of things you can do to make the business appear to lose money for purposes of taxes (this is common) because you can deduct losses while the hockey team is actually profitable. Without a look at their financials I won't go into specifics, but through depreciation of tangible assets, "other" expenses, travel costs, and other line items, it's possible (hell, ideally) for a team to be profitable for purposes of the salary cap (which the Sharks are) but then deduct items which makes the club appear to be losing money for purposes of taxes.
The NBA lost $400mm last year. The NHL grew revenue (meaning they made more money than they did the prior year).
The Leafs top this mythical list because MLSE is highly diversified into such things as condos, retail, restaurants, and charging some of the highest ticket prices of any North American sports franchise (because demand outweighs supply by tonnes; this is what happens when your STH renewal rate after a lockout year is over 99.6%).
1) The list of teams in trouble is Phoenix (no owner) and NYI (need a new building). Florida is stable, Tampa is stable, Nashville is stable. Ottawa is bleeding money but Eugene Melnyk seems happy to bleed money, write the losses off, and make promises about winning. Atlanta relocated to Winnipeg and has a 3-5 year window where they will be fine. Carolina ebbs and flows but has stable ownership. Dallas has a new owner so they should be fine. NJD will be fine if they start playing better (ticket sales will improve).
2) The most obvious answer is charge more for tickets, or at least stop giving tickets away. Increased tv rights fees (which for US teams kicked in at the start of this season with the new NBC deal which more than doubled what NBC/Versus was paying last year), improved local tv ratings (which drives what advertisers pay for ads during games), and of course cost controls.
3) Expansion is probably years away. You need to cure Phoenix and NYI and then you can start to look at expansion (assuming you have a market, an owner, and an arena either existing or that is ready to be built).