If all pubs were good players, you'd just see a lot of camping because of the lack of coordination. Unlike clan wars where you have a plan of attack, pubs don't coordinate much even if they're individually good players and you won't have the "right" tanks with you either.
I doubt it would devolve into a campfest. Camping is the worst thing you can do. When it comes to protecting your arty, its best to bring the fight to the enemy as far away from them as possible. Also getting to places first on the map can give you a large tactical advantage just for the pure angle of denying your enemy thier "usual" place, which will usually make them more vulnerable to arty.
Either way, Possessed and I will never be campers no matter the makeup of our competition. We are almost always on the front lines, either leading the charge, or making sure we can support it. Camping isn't fun, and its detrimental to your team. Its one less tank on the front lines to absord and return fire.
If everyone was good, would this tactic work as well? who knows. But then again even if everyone was good, there is always going to be people that are better. The biggest difference I would see if people were all good is they would actually be able to hit those elcs and 50-2s.
Actually funny story, on the magic forest map I one shotted an elc moving full speed through the town with my t34 in the first 40 sec or so of the match at around 200m. A few people said "ns" in chat, and then asked if it was a gold round. Its like people think gold rounds are magical or something. Either way, I"m still convinced 90% of players have no idea how to lead a moving target. Maybe they are just so used to shooting lasers in other games, that shell trajectory and velocity are just lost on them.