No, it should take one person to take down a tank.
But it shouldn't be as easy as "LOCKBOOMLOCKBOOM" lol dead tank
or "Don't worry guys I'll handle the tank" *chucks 3 Lai Dais and jumps over the burning wreck*.

It should require things like webifiers, emps that freeze weapons, **** like this that makes it hell for the tank, can be done by a single person, can be made easier by a group of people (Like, one guy with webs slowing the guy to a crawl, one guy with something that jams the weapons and one that unloads a forge into the guys rear). Which in turn would give tanks more reason to run with Infantry.

Before we'd get stomped by AV and then told "use teamwork", but honestly unless it was a tank squad (which cost millions of ISK) we couldn't use teamwork, because we were getting battered from a massive distance by all AV, it took a few Lai Dais to kill us before friendly Infantry could even react. Now we can, we can survive longer now, so by promoting teamwork through AV (but not making it a necessity) means Tanks would look to Infantry for support.

I mean imagine a squad of three AVers with the following setup of weapons I'd like to see.
Webifier Weapon that when fired (like a laser) can reduce the movment speed of a tank to a slow crawl, stupidly slow.
A weapon that can be thrown that like an AV grenade, seeks the target and locks up the turrets of the vehicle, very slow rotation speed, massive overheat when firing weapon and possibly other things, debuff lasts for let's say 10 seconds.
A Forge Gunner.

So we're imagining, Tank rolling down the street with not a care in the world, A Forge hits it, Tank immediately pops shield hardeners, looks for target.

Webifier and guy with the turret malfunction equipment sneak up behind the tank, they fire at it from cover. Tank turns around to fire back, easy kills right?. Forge hits it a second time and the tank turns his turret, back, the support fire their weapons, it's now very slow and cannot turn its turret very fast, it remains like this as the hardener runs out.

Forge gun aims at Tank rear because tank cannot speed away nor rotate very fast, Tank is slain, drops 9 gil and a potion.

This could be a very likely story if ewar was added and functioning well within the game. With ewar would come reasons a tanker would like to be by Infantry, if you're stuck in the situation as above and have an Infantry friend, the guys with webs and equipment to make the tank malfunction can be dropped to allow the tank to escape, rather than the Tanker hoping he can solo all the things.

I mean imagine a squad of three AVers with the following setup of weapons I'd like to see.
Webifier Weapon that when fired (like a laser) can reduce the movment speed of a tank to a slow crawl, stupidly slow.
A weapon that can be thrown that like an AV grenade, seeks the target and locks up the turrets of the vehicle, very slow rotation speed, massive overheat when firing weapon and possibly other things, debuff lasts for let's say 10 seconds.
A Forge Gunner.