Where can you observe the total longs vs. shorts?
I think it is not possible unless you have some coins waiting and you can see that nobody is shorting but bitcoins will be borrowed almost within heartbeat.
The leverage game hinges on the integrity of the platform. If the platform is not running fractional reserve, and the safety margins are large enough, then the short squeeze can possibly be epic, because the number of entities who have enough bitcoins to trigger it is enormous, yet the number and value of XMR that can hinder it is limited. All shorts lose everything.
But if the platform is corrupt, then they will just create more XMR in their system in the event of a squeeze, tapering it off, and hoping they can recoup the position later by buying in their system and canceling the bought XMR against their undisclosed short. If the recouping does not work out, they have a systemic short position, and they can only play time with restricting withdrawals until the eventual happens - they don't have any XMR in their wallets, yet do have them in the system, people cannot withdraw, and it goes down in flames.
This is a widely accepted theory of Mt.Gox fall. A successful long squeeze is possible only in the event that the coin is tending towards zero for its own merits. Even if it drops to zero in a platform, as long as the platform is honest, this will just be an incredible opportunity for the believers to amass more coins. It does not make the coin valueless, any more than the Mt.Gox hack in 2011 made BTC valueless (the system price dropped to 0.01 during the event, from the previous value of about $17).
Of course real XMR selling pressure or shorting pressure can depress the price such that longs are forced to liquidate by the system rules, and this will cause them to suffer losses. But the winners in this case are not the shorters, as the price will bounce back, and obtaining the sold/shorter XMR back without spiking the price more is really difficult. The winners are the patient buyers who just get to buy cheaper.
I advise against participating in the margin game, because historically there is no much evidence that the platforms can deliver in a black swan event. So if you lose, you lose; if you win, the bank loses, and therefore you also lose. Even keeping any value in platforms that enable margin trading is (if possible) even more reckless than keeping it in non-margin platforms, which is reckless.