The problem with the triple lock is that it is unsustainable in the long term. Whatever the merits were of introducing it in the first place, it is going to turn into a game of chicken for successive governments, because whichever party abolishes it will be on end receiving end of vitriol that will make the WFA arguments look like a vicarage tea party.
Since the triple lock was introduced, there have been 14 revisions of the state pension. Of those, four were based on the average earnings clause, six on RPI/CPI inflation, and four on the "minimum 2.5%" clause. (Source: This parliamentary report [PDF] through 2023, plus the BBC website for this year's numbers.)
So in 10 of those 14 years, the burden on earners/taxpayers to pay those pensions went up faster than the wages on which their ability to pay was based. You can't keep doing that for ever.