If people were smart, and it was coded so you'd suffer a net loss of PL unless you used it against a MUCH stronger opponent, this wouldn't be a problem.
Of course, I could see some people just going around and constantly spamming with it. However, if their PL dropped each time, eventually it would become weaker and weaker while the fighters of the server grew stronger & stronger.
Basically, I think it would be good to code in a huge PL drop, so you'd only use it if:
-Totally outclassed
-Surrounded
-Creating a large threat for a strategic advantage for your team
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Or, SDing could cause a longer respawn time, thus reducing the spammage much like the waiting between posts severely hampers dedicated forum spammers.
Once again, this delay would mean you sit in limbo while others are out there fighting and gaining PL, making you effectively lose PL unless you used the SD at a correct time. And in a team game, your team is down a member for a while as a trade off for that one powerful attack.