Seems the Gerans are replacing the Lancet in some front line strikes roles?
Not. Lancets are rarely used for location destruction. Lancets are basically used to destroy vehicles and artillery pieces. Vehicles will also include boats on sea and planes on an airfield field. You don't see Lancets used against temporary deployment points, UAV control points, ammunition depots and fixed sites like houses. We have seen Lancets hit radars and EW systems though, but I suppose they might be considered vehicular.
Gerans didn't replace anything. They merely filled a gap instead between glide FABs, Iskanders, Moliniyas, ground and rocket artillery in tactical strikes.
Molniya winged FPV drones don't replace Lancets either. These drones are mostly used against fixed sites, like small bunkers and strongholds. However, Molniya are rarely, if ever, used against vehicles and moving targets.
Similar to Moliniyas, Gerans lack the ability to target a moving vehicle. They are only programmed to hit an X,Y location via GLONASS.
In contrast to those two, a Lancet is capable of following and hitting a moving target.
A Lancet only holds a 5kg warhead. That's similar to a 120mm mortar shell, a 122 artillery or 125mm HE tank shell in filling. A Molniya can hold a TM-62 antitank mine. Each of these mines have a 7kg explosive filling, similar to a 152mm or 155mm shell. A Geran has about 90kg of explosive filling. So no comparison in the bang.
So they each have their niche.
There's also a huge increase in the use of LMUR lately. In contrast to those drones, a LMUR has a 30kg warhead size.