If it goes ahead in that form, it will be taken apart by the opposition.
Firstly, questions will be asked about funding it because, as you know as well as I do, people don't understand MMT.
Next, presumably if the suggestion is that UC is increased to £250pw, pensions would also need to be increased to the same amount. There would be considerable resentment from people who have "bought back" years to boost their pensions.
Another point would be about wage differentials. A considerable number of people currently earn just over £15 and have trained for the jobs they have. In some cases, they've paid for the training and they're not going to be too happy that any unskilled person in employment can earn almost the same as they can. Wages would need to increase across the board, which would probably lead to inflation and the £15 not buying as much as expected.
It's also noticeable what's missing, eg. investment in school buildings, hospitals, police numbers, etc.
I like the proposals for more council housing, green jobs and broadband.
However, I don't think those proposals as a whole would appeal to the JAMs, who comprise the group Labour needs to bring back.