I would either stick if you like it, find it comfortable and nice to drive (I could not say so about my previous cars). Who cares what other people think.
OR you fancy something more economic, more comfortable, more shiny (not a another Beatle imitation for gods sake!). Plenty of nice bigger VWs and BMWs around. Or you could get 4x4 or convertible or a whole VAN. Choice is yours, and shouldn't be based on mileage and age alone.
I would however never ever buy a small car new. Waste of money.