Just remember, these "well off" pensioners have paid loads of tax and national insurance as well
That may be the case, but it doesn't work like that. It's not a savings account. The tax and NI that those pensioners paid was spent at the time.
Current taxpayers are funding the current free TV licences, often for people with far more assets and/or disposable income than themselves.
The fact is that the current generation of pensioners are, on average, the wealthiest and most privelidged in history and if the country doesn't stop giving consessions to this group of people, it just increases the load on younger people, who are already likely to work longer and receive smaller pensions when they do retire, at the same time as paying off massive student loans and bigger mortgages.