I've had mine for around 4 years, many times with heavy gaming, and it still works great.
If this ever happened to mine, it's an easy fix I pressume.
The DSi XL reminds me of all the versions released of Street Fighter 2. All that is missing is "Super DSi XL" and possible "Super DSi XXL Turbo"
I personally won't get one, sine my DS Lite is in perfect working order and I have no need to "upgrade".