I fear this too but I view it perhaps differently and less optimistically than you.
If the government continues to feed the population benefits which are hugely over the minimum amount they need to live on, repeat NEED to live on, not the amount they minimally WANT to live on, then the disincentive to work at near minimum wage levels will continue to erode.
However, raising pay levels won't solve this because the fact is there is a huge number of people claiming benefits at a level which is comfortable to live on who either have no intention to ever work or who supplement their benefits with undeclared earnings from somewhere.
I cooked yesterday, a pot of Japanese curry, which will feed 12 portions. The total cost for chicken breasts, carrots, potatoes, onions, peppers and the sauces was about £8. You can add rice from a 20kg sack I buy for virtually nothing per portion and it all freezes perfectly.
So we have 12 very good, well balanced and healthy meals for about £0.67 each and if you are unemployed or even if you are employed it is as simple as cutting up the vegetable and chicken and putting them into a large pot on the cooker. No major culinary skills required.
i cooked 500g of diced stewing beef with 3, onions, 4 carrots half a swede a large handful of pearl barley and a stock cube plus some herbs into a lovely stew for about £3.
But the issue is in my view that universal credit is a great idea poorly implemented. They have put in a max amount for all benefits but the amount needed to live on varies by location and circumstance
For example I would say 1 single guy in Reading's NEEDS are
Room in a shared house between £110 per week no bills and £650 per month inc bills at a quick glance on gumtree so call it £500 pcm absolute min
Food £50 a week min for a single guy with restricted cooking/fridge facilities (call it £250 a month)
So i reckon £750pcm to survive
UC cap is i think £1100 so you will actually have an £350pcm for everything else which is fine
But add in a kid and the accommodation goes up hugely, the food goes up a bit, you would have childcare costs if you try and do any work
Your UC cap would go to £20k (more than a young single parent is going to earn after tax and way more than what would be left after childcare costs)
Cheapest 2 bed place to rent (same as my old terrace house) is £900 pcm plus bills (e rated epc certificate and pre pay meters so going to be £250+ pcm) food is going to be £10 a day so £300pcm, you are already at £1450 of your £1666 so c£200 left and all you have done is survive, you havent bought any clothing (and kids get through a lot of that), toys, books, done laundry (and that is a big one if you dont have a washing machine in the house have you looked at laundrette prices recently)
The other issue is with UC centrally controlled there is no incentive on local councils to sort things out locally like there was when Housing Benefit came out the council's coffers
If you take accommodation out of UC it becomes far fairer (and easier to administer)
You then can allow/force/empower local authoprities to come up with local solutions to housing issue sin their area