Should number of tacklers be limited?

[Acker79]

utter rubbish. have you watched much football? if two players are closing on a player with the ball that leaves a space behind (or elsewhere) to exploit. should the player with the ball beat the on coming defenders or pass to another player, the defense is now at a disadvantage as they are out of position. so rather than being inherently unfair, its a somewhat risky tactic.

That's assuming the defenders are far enough away when they start closing down, that they are coming from the same direction. Most often those two tacklers come from behind and are on the player before he realises.

Equally often that "space behind" is unoccupied meaning the options are let the two of them muscle him off the ball, or kick the ball away and lose possession.

Sometimes these two on ones occur when there are a lot of defensive players back, and kicking the the ball away (assuming you have time and are aware of the defenders closing you down enough to react).