Yes it would be great to give everyone free bus travel and put up their money each year. But the country is already in a financial black hole.
Most other benefits have been frozen for years but pensioners protected. Also the bus pass is given universally and not means tested, where as the bus pass for the unemployed was axed years ago.
There are many people like my wealthy ex in-laws who used the bus pass to avoid paying parking and getting the BMW scratched. The state pension they always called peanuts - as it was compared to their final salary pension. These changes would not affect their lifestyle one bit.
Ideally I'd like unemployed people and poor pensioners to get some help with bus travel (as it can be super expensive) and increases each year in money to allow people at the bottom to live their life with dignity, regardless of age.
jobhap.com/bus-passes-and-state-pensions-triple-lock-threat-on-brexit/