Will resurfacing cause any problems to the disc in the future?
Resurfacing removes a thin layer of disc coating. Basically it doesn't remove scratches so much as grind the outer layer down so the scratches are no longer there. Blu-Ray discs have a clear-coat applied after the data is recorded. Unless it's a severe scratch, I wouldn't mess with it.
Getting a disc resurfaced
once shouldn't be a problem. It's when it is done more than once that you could possibly damage the data area. I don't know what pressure is applied to the disc in the resurfacing machine. Again, I avoid any excess flexing of discs as I don't want to allow any contamination to the sensitive data inside.