RRoD had to do with under engineering and poor QC. This is not an issue I'd expect to see with the XB1 in light of the fiasco MS had to deal with in the XB360.
If I actually wanted an XB1 on release day, I would be buying with confidence.
As for the upclock on the GPU; yes, it will require more power and will generate more heat, but I'm pretty sure it will be well within the design operating specs.
Keep in mind the XB1 box and its cooling system were designed to avoid RRoD type failures. The box itself is larger and I'm sure a great deal of thought went into keeping airflow and heat management at reliable levels.







