The first response we need from Blizzard is to acknowledge that this is an exploit. As in, a very concise and clear statement that exploiting layer hopping for personal gain is against the rules of the game.
Everything else should move on from there, including fixing the exploit, rolling back gains (including level XP aka World’s First 60, including MC clearing including World’s First MC clear). Lastly, suspensions should be made, and this absolutely includes streamers, specifically the extremely large ones that provide Blizzard with a constant flow of free marketing.
Blizzard is in a tough spot. For them to truly acknowledge this exploit means they need to take action against the massive free marketing they are receiving via Twitch streamers. Make no mistake, these streamers provide Blizzard with massive marketing efforts for free. If Blizzard bans these streamers then they are going to take a lot of heat.
It is a tough spot: A) Hurt the community but get free marketing (allow exploit + streamers) or B) Repair trust with the community, fix the exploit, suspend abusers (streamers) and lose free marketing.