The Bridgestones last so long that if you only keep a car 3 years and do average miles, you'll be doing most of those miles on the Bridgestones. They are a handicap on the car, i'd get them off ASAP, stick them in the loft or the garage for if you go to sell the car or p/x itwhen a new set of rubber would be required.
Coming up to 25650 miles and I swapped the Bridgestones for Michelin PSS at around 6000 miles. Just had year 3 service and MOT - PSS still at 5.5mm on the fronts and 4mm on the rears according to the VW dealership advisory report (how the rears are wearing faster than the fronts, and with no abnormal wear is a mystery to me, as the R is heavily front biased, and the front wheels are steering.
Not sure whether they got their numbers the wrong way round as I seem to have self healing brake discs (warranty work in Jan, 80% worn rear discs; Service at the end of May and I have 70% worn rear discs and a suggestion to spend £268 to replace them).
When the rear discs get replaced I won't be going OEM - those rusty hubs look sh!te, as do the very rusty disc shrouds. On an R at least, the PSS wear well, front and back - did not expect to likely get 30k miles out of a set of tyres on a 300ps car before they're down to 2.5mm