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Currently, the cap for the Super Smash Bros. Melee 1v1 tournament has been reached at 1024 people. That number would likely be even higher if the cap wasn't 1024, which is insane considering Melee was released over a decade ago and is played on inferior technology. At the time of writing this, Super Smash Bros. has 188 people registered for 1v1. The newest installment in the series. Super Smash Bros. for Wii U, has 829 entrants for the 1v1 tournament.
With Nintendo officially sponsoring Apex and tournament entry records being broken, 2015 seems to be destined to be a fantastic year for Smash.