Transform Ranked system into real seasons

Introduction

English is not my native language, sorry

We are having seasonal system now, but it is fake seasons.
All valve's do is just hiding your old mmr in new season calibration, then summing up points after you played calibration and giving you 'new' rank.
But your mmr stays alike the same +- ~200 points.

Problem

Today's system not so bad, but actual mmr was never wiped and large number of boosters/account buyers appears from here.
Its cheap to boost/buy high level account, valve announced restriction for boosting/account buying, but its not working as expected.
Also role system is disabled on high mmr games.

Proposal

What i suggest is to make seasons lasting 6 month, with optional prises (for example same as guild prises) to region leaders.
New season should start from flattening players by groups, like:

• 0 – 1k -> 0.5k
• 1k-2k -> 1k
• 2k-3k -> 1.5k
• 3k-4k -> 2k
• 4k-5k -> 2.5k
• 5k-6k -> 3k
• 6k-7k -> 3.5k
• 7k-8k -> 4k
• 8k+ -> 5k

At the same time i do not propose to remove calibration system.
We can have two systems work together: flattening (to group players closely) + calibration (for accuracy on flattening, so player can be on top/bottom mmr in group).

Pros

As a result – with a proposed season system boosters/account buyers will dissapear itself, because it will be completely unprofitable.
And it will bind players to their real skill bracket (maybe after some seasons), resulting to an interesting and balanced games.
Role system can be returned on high mmr games.