The price of stable coins is stable and it depends from the assets that stable coins are backed up. The same will be with security tokens. Their price will depend from the assets they are backed up.
It is very bad for investors when price for cryptocurrency falls. During the whole 2018 the price for cryptocurrency falled. Now cryptocurrency market restore a little bit.
It is very hard for crypto startups to developt because the price of the tokens falls. It is also hard to attract money on ICO and IEO.