We can encourage them by let them experiment with it, let them test it and than they will soon or later gonna sue it for sure.
No We cant encourage them by experiment with it. If i am a business man, I want to have an advantages to encourage me to use this bitcoin. But How will you encourage me? What is the best advantages using this coin? The price of this coin is not stable so if they pay using this bitcoin, and the price decrease i will lose some profit. Thats not good in business

You don't have to cash out when the price has decreased. You can always wait for a few more months before cashing out and that would give you profit. All of these is just a seasonal thing. There are times when bitcoin's down, and there are times when bitcoin's up. Just convert your coins when the price is much higher than when you acquired those coins and you'll be fine.
But if you're still worried that some emergency might be in the way that would force you to cash out at a price dip, then just convert the coins to fiat right when you received it.