Evolution of the Metagame

On the occasions that I step into ranked nowadays there are several common bans that I see pretty much every match:
Shaco- His very strong early game ganks and strength of jungling.
Morgana- Her massive laning presence, in built survivability and CC shield, and powerful teamfight ult
Kassadin- Shuts down the majority of mids and kills squishy champions in seconds
Shen- Powerful solotop bruiser, able to teleport to allied champions and turn any fight in your favor.
Cassiopeia- Pretty much the same reasons as Morgana

These four I will commonly see immediately banned in every single ranked match without the team captains thinking about any other options. All four of them have decent counters and their presence can be negated fairly  easily with the right team composition, captains should be focusing their bans on what would prevent their strategy and what champions their team specifically struggles against as opposed to what the community deems 'op' currently.

As most of you know the current metagame is generally bruiser solotop, mage mid, and carry/support bot lane, it's been proven to work time and time again in tournament play and is a go to decent strategy to use. However when I first came to have an interest in competitive play the apparent metagame was quite different. The first 'competitive' match I watched was Noxus vs Ionia, though not a true tournament game it still shows what the playstyle was like back in 2010. Mage top, AD carry mid, tank/support bot. This would truly horrify anyone playing ranked nowadays as clearly our modern playstyle is the best right?  Well Judging by the play by Fnatic in Dreamhack running a double mage setup and more recently by Dignitas in IPL4, no. Choosing three champions defined as 'support champions' by riot to allow Kog'Maw to super-carry and shred the enemy team.

With various team composition proven to be viable why do people feel the need to be shoehorned into a rigid metagame? I suppose the mantra of 'If it aint broke, don't fix it' could be the mentality of many players however I believe that the majority of characters in League of Legends are viable ranked picks, at least for starting out in ranked, and that skill level matters more than getting the better team. AoE teams, Poke Teams, Triple Support, 'Meta'-Teams, are all viable and doable in ranked and it is more important to use your bans to stop any specific threats that your planned team composition can't deal with or that specific players hate playing against. Team cohesion, planning and skill are all far more important than conforming to the meta.

So a few little thoughts on the current meta, I'm still no LoL expert so feel free to completely disregard everything I say if I'm wrong.

Now we wait for the meta to change again...