The Mk1 TT is now 21 years old and has found huge popularity as a modern classic thanks to its looks and usability. The Mk2 that you have still has a way to go, although there's a decent chance of it making it to modern classic status. Whether you choose to keep it or not will depend entirely on your personal situation. You'll need to set some money aside over the next decade as the car starts to wear out. And you'll probably want to relegate it to second car status at some point to keep the miles off it a bit. A much better question to ask yourself is, 'How much do I like the car?' If you're happy with it and have no problem keeping it on the road, then just enjoy it and don't get too hung up on whether it'll be a classic or view it as an investment.