A design/graphics degree would be fine as far as getting a pilot job.

IMO a pilot should have a backup degree to fall back on though, so this means something practical like accounting, pharmacy, computer programming, nursing, etc. If you can make a living with a design degree, go for it. Like certain other fields you can probably stay current by doing part-time work so you can rapidly transition to to full time if (when) you need to.

The odds are against you remaining continuously employed as a pilot for 40 years.