I believe POS should only be a serious option, and perhaps worth implementing, once there is no more pre-mine left.
That is why i put on this suggestion (see quote). In my suggesytion there, by staking the coins, it will be distributed as part of the premine that was meant for the distribution. So premine will go lower and people can stake for interest and it will attract more investors and users as well. Just as it was meant to be in the first place for the premine. But then in a slighty other way

And total coins will stay the same

So, an idea maybe on this?:
When staking will be introduced, then the coins added to the total coins in circulation by the staking, that amount of staked coins can be lowered maybe at the premine part that was meant for distribution, by burning the amount of total staked coins in a month f.e. in the premine? So total coins will stay the same and people can stake and have some interest.
Just only a suggestion, but i like the idea

I like your idea too.
I do believe POS might attract a few investors, yet I still doubt implementing it would help in spreading Guldencoin.
In fact, from a marketing point of view, I believe implementing POS might do potential damage to reputation more worse than good. Guldencoin started with 10% pre-mine of all available coins ever to be mined. Adding POS to that, is a lot of power, which, I believe, might become a story hard to sell.