Why would the 6 owner of these adresses, who most likely are exchanges with no contact to each other, want to colaborate to destroy the coin when they hold such a huge amount of it?
You have a fair point, but I think PoS is considerably better than the current system. I'm not totally against auxPoW either, but I don't trust LTC to maintain an high value for a long enough time to make it truly worthwhile to fork to be merge-minable with them.
The doge community badly needs an education on how AuxPoW works... if you decide to be merge-minable, then you can be merge-mined with ANY parent chain - you aren't dependent on Litecoin, you're dependent on scrypt mining (just as you already are). So, as long as there is a strong scrypt mining network, you're good. And, considering all the investment going into scrypt mining hardware, do you really think it's going to fade away anytime soon? Pretty unlikely.
That said, I want some of what you're smoking if you don't think Litecoin's exponential hashrate is an indication of where its value is headed.
An high hashrate is only one of the many criterions which determine the price. Pesetacoin has an hashrate of about 200 Gh/s, and its market cap is still at less than 40 000$. Litecoin, having no considerable advantages over other coins and a small community, seems overrated to me.
I know that auxPoW allows to merge-mine with any scrypt coin, but I don't think that any scrypt coin beside Doge has a bright future.