Hombre:
Personally I do not give a fig how many grams, pounds ounces or tons of CO2 you ot youre mates on bike do or do not produce - you should be taxed, licensed and insured in the same way as every other road user. Why do you think you should have a free ride? (Please pardon the pun).
As for "someone with a driving licence (I assume you mean for a motorised vehicle) having to obtain a cycle licence, then yes, Why not? For many years I held an HGV class 1, but could drive neither a road roller, mototised mowing machine or two wheeled vehicle over 50cc - why should cyclists be exempt?
Incidentally, due to having taken additional tests I am now the proud owner of a licence allowing me to drive motorcycles, road rollers and motorised mowing machines, I still do not have proficiency in a push bike - if I wanted to ride one on Her Majestys Highways then should it be deemed necessary I would avail my self of the required document. More likely I would get a cab.
The fact that you dont like the cycle paths provided to you is actually irrellevant, they have been provided at no cost to the cyclist, yet you still arent happy. Need I say more?

I dont think your getting what im putting.
Not only should you be critisizing cyclist for not paying tax, but also owners of classic cars and electric cars, who also dont pay tax.
Have a read of what i put, take it in.
Cycle paths are just that, a path, many just have a blue sign on to say its a cycle path.
Another licence for a bicycle? What age are you going to bring this in then?
“thats it son/daughter, you can ride in the back garden but you cant go any further now, you dont have a licence”
Im not talking about how little co2 im producing, if you actually knew something, you would know that car manufacturers are/were trying to get cars below the 35g co2 level, so the car didnt need tax.
Well done, you have a licence with everything on. 
I dont have a proficency in a bicycle, i taught myself.
Did you know theres a course you can do on a bike, where you are taught to ride on the road? Not like the proficency test.
My brother did that, he doesnt know how to safely ride a bike on the road and rides in the gutter.
He wont go down the left hand side of lorries though after me and my dad drummed it into him to not do it.
Now Hombre, go and read my posts, understand then, answer my questions or tell me you dont actually know the answer.
Or just dont bother, you will be down on the level of the people that seem to think cyclist dont pay anything towards the roads, dont have any rights, and you probably moan on about the person thats just trying to get to work or train, but cant afford a car, or doesnt want a car.