Nothing is safe. A fact, that validity period of HTP's special legal status will be extended until Jan 2049, give us some level of confidence. It won't be that easy to turn around.
Belarus is the source of great engineers that created Viber, Juno, MSQRD, WoT to name a few. PVT revenues will reach $1 bln. in 2017. This decree just added more perks to already existing tax privileges.
The system is stable and growing, why kill the cash-cow? IT enterprise is not and oil factory that you can nationalize. Engineers will take the laptop and fly away same day and your seized company will turn into empty building with zero profit. Even dictators understand it.