The Islamists might be disappointed. They lost three of their "warriors" and not a single one of the infidels got killed.

The Russian security apparatus has become efficient over the years, after learning from their mistakes during the 1990s. There is still a long way to go before eradicating terrorism in the North Caucasus, but the signs are looking good.
Seems to have been a pretty limp attempt. The Russians brushed it off easily. They´re obviously prepared, what with their whacking terrorists in Syria. There´ll be more attempts at retribution for that.
Most of the "experienced" terrorists are either dead, behind the bars, or fighting along with the ISIS in Syria. Those who remain in the North Caucasus region are mostly the inexperienced ones. Also, the local support for radical Islamism is waning, after Kremlin took efforts to reduce the inflow of Salafist/Wahhabi funds from Saudi Arabia and Qatar.
Yes, it´s difficult to have any meaningful organization going unless you have some support among the population and the Russians are likely to have that covered. Unlike authorities in western Europe which seem to just love having this terrorist vermin organize under their noses. There´s even no-go zones to make sure that they can prepare in peace. Then the authorities act all surprised when they get attacked.