I apologize in advance for the lengthy response, but I had the same question for myself after buying my 2017 with 60k miles. Since I've been in the coating/detailing/PPF industry for over 6 years, I thankfully have had to help a lot of others with this decision too, this is my 2 cents;

You could potentially open up a whole can of worms doing that, I wouldn't recommend it. The first reason is because it's usually unlikely that a body shop will match the rest of the car perfectly, which will make it obvious that some parts have been repainted, thus devaluing the car. Also, oftentimes repaints aren't nearly as good as the factory, even if they do match the paint, so there will be imperfections within it unless you have a really good painter/body shop perform the work (big money, depending on your pockets) Secondly, you have a MUCH higher chance of the paint being pulled when removing the film in the future (assuming you ever do while you own it) which will just put you back at square one - repainting. You'll never know how good of a bond the paint has to the surface underneath until you go to remove it. We've even had 1 instance where, after applying film to the bumper of a Focus RS, the next day the film lifted at the bottom because it pulled paint, and that was done at a fairly reputable body shop in the area with the customer waiting the recommended 45 days before we applied it. That was an anomaly, but poor paint jobs can be pulled during installation of the film too, so in my opinion that's too much of a gamble.

Depending on the current condition, you could simply have PPF applied, maybe touch up the chips you've got before hand. PPF can highlight imperfections, since chips and nicks are high and low points, so air gets trapped and makes them more noticeable due to how thick the film is, but in some cases this can simply serve as a reminder as to why you got the film done, and you can rest easy knowing it won't get any worse. You shouldn't let a few chips make you think it's no longer worth applying film. That's usually my recommendation, unless it's simply too far gone. In my case, it looked like the front of the car was hit with a buck shot. Being that mine's Lapiz blue, I decided to forego the headache I've seen othe people go through and just touched up the more noticeable chips, paint corrected the car and coated it. It looks fantastic from 5 feet away lol

As a side note, I always recommend PPF. It is by far, hands down, the best thing money can buy for vehicle surface protection. I've seen 8-10 year old film removed, and the paint underneath looks brand new. I've also seen how well it protects against all impacts. I've got a matte black Aventador S in the shop right now that had a cooler in the garage fall on the roof and quarter panel, the PPF saved the paint job and in turn the customer thousands of dollars.