Well, I said 'acceptable.' I didn't say 'only.' There are a lot of different options for handling ledge stalling. SK92 runs to the edge of the stage and shields, or short hops, hoping he can trick his opponent into a punishable move.
Different players have their own way of handling edgehogging. But, if you're playing friendlies and there isn't a clock, ground lasers are a perfectly viable method of stopping it. Mainly, it's a battle of endurance, and it's a hell of a lot easier spamming B, than it is edgehogging =) .Typically, the other person will grow bored of it.
If you're in tournement, I guess what I said isn't viable due to a clock. The best responce is probably SK92's. But, as far as I know, this thread was outlining "possible" uses of ground laser. This is just one "possible" use for it, eh? =)