Wired to Wireless Doorbell
Don‘t tear the wires out

Some newer doorbells are going wireless.  But this is not a universal trend. Better doorbells are actually wired, because they do things that take power.  They are lighted (like, the button glows), they have cameras or WiFi, motion sensors,  microphones, speakers, etc.  Those things are not possible on battery.    

Also, the wireless doorbells I have seen are not well built, and don't last.  I would expect quality ones to work both wired or wireless.  

It would be silly to, a few years later, pay an electrician to re-run the wires... Or have to forego a nice doorbell because of no wires.  

In other words, I think "wireless" is a fad.  

I would simply disconnect the wires at both ends without cutting or damaging them.  The other end will be the chime, and it's quite likely the transformer is near that.   Sometimes, doorbells coattail on the furnace/thermostat transformer.