I would say that Snorlax should not be banned from GSC OU. It is obv the best pokemon in GSC, and it defines the metagame, but this is not a bad thing.Snorlax has a lot of sets, and theres not any pokemon that can beat every lax set, but every set has its hard counters, except maybe LK versions. If theres anything about Lax that could make it "maybe" broke, it is LK (especially BD + LK versions).
I think Lax is fine in GSC OU even with LK though.
About a metagame without Snorlax. I have won a
non Lax GSC tourney, and what I saw was that some teams (especially stall teams) tried to replace Snorlax with Blissey, so those teams were more solid, but they didnt have any solid offense, so those really really long stall vs stall GSC games were much more common (Blissey is much better at tanking hits, but its worthless offensively, and without Lax, stalls lost their main offense).
Another kind of team I used in some games was abusing Growth users + BP, since Bliss cannot pressure them (its just a set up fodder, unlike lax), and Raikou cannot take all those growth users alone.
Explosion teams were still very good, but they missed Snorlax a lot, same with teams based in things like Marowak (BDlax + SDwak based teams).
Mixed sweepers like Dnite or Nidoking were much better in a metagame with no Snorlax though, and some sweepers like BD charizard + paralysis support were also better though.
So basically: most stalls tried to replace Lax with Bliss, but Bliss is worthless offensively so stall vs stall games were really long, and Bliss is also a set up fodder vs a lot of things. Things like explosion teams (Lax was the best boom user) and teams based on threats like Marowak (BDLax + BDWak to break skarm) were generally worse, while mixed sweepers and some sweepers like BD zard were better in a non lax metagame.
After playing that metagame, I really prefer the lax metagame, although I might support a possible LK + Lax ban, which is what makes lax maybe "too" good, although as I said, I think its fine even with LK