Obviously the wall alone isnt going to work.
And to tell you the truth it would be easier to just stop supporting illegals in anyway,and as you said make it financially unwise to hire them.
Yeah, I think as long as the jobs are there people will find a way. Border security is certainly a must but not an end all. Same old story if we would just enforce our laws.
A physical wall isnt really necessary if you put the manpower and tech on the border,which needs to be done to stop drug trafficking and possible terrorist incursions as well as illegals.
Any fence or wall can be breached with a tunnel or extension ladder if it is unguarded
So the challenge is that we need to guard the 2000 miles of fence in addition to building it. Our biggest impediment to crossing is not a physical barrier, but vast expanses of desert that must be crossed. Aircraft, drones, cameras and sensors can pick up when someone is crossing that empty land and border agents can be sent to intercept
Some portions of the border have vast expanses of desert, others not, see El Paso/Ciudad Juarez for example.
Some portions of the wall will need guards, others not so much (see vast expanses of desert).
Some portions of the wall could have aircraft, drones, cameras and sensors to pick up when someone is crossing and border agents can be sent to intercept.